Maupas_1900

MODES AND FORMS OF REPRODUCTION OF NEMATODES. 171

Fig. 1. A, B. Male tail of Rhabditis Caussaneli seen frontface and sideways: i, intestine; c, deferent canal; g, rectal glands; s, spicules and gubernaculum (accessory piece). Mag. 395.

Fig. 2. Juvenile of the same having just hatched: r, genital rudiment. Mag. 335.

3.Adult female of Rhabditis Marionis: v, vulva; o, oviduct; g, ovary; a, anus. Mag. 80.

4.Anterior end, mouth and buccal cavity. Mag. 810.

5.Esophagus: c, nerve ring: e, excretory pore with its ascending and descending canals; g, unicellular gland. Mag. 335.

6.Female tail: a, anus; g, rectal glands; p, lateral papilla. Mag. 335.

7.A, B. male tail seen fullface and sideways: i, intestine; c, deferent canal; g, rectal glands. Mag. 395.

8.Spicule and gubernaculum (accessory piece) seen sideways. Mag. 1280.

9.Eggs at the six-blastomere stage. Mag. 335.

10.Spermatozoa. Mag. 1460.

11.Juvenile having just hatched: r, genital rudiment. Mag. 335.

12.Spermatozoa of Rhabditis Duthiersi. Mag. 1460.

13.Nuclei of spermatozoa of the same treated with acetic acid. Mag. 1460.

PLATE XIX

Fig. 1. Adult female of Rhabditis Duthiersi; v, vulva; o, oviduct; g, ovary; a, anus. Mag. 80.

2.Anterior end, mouth and buccal cavity. Mag. 395.

3.Esophagus: c, nerve ring; p, excretory pore. Mag. 335.

4.Female tail: g, rectal glands; a, anus; p, lateral papilla. Mag. 335.

5.Eggs at the twoand six-cell stages. Mag. 335.

6.A, B. Male tail seen fullface andce:side,intestine;fa c, deferent canal;g , rectal glands. Mag. 395.

7.Spicule and gubernaculum (accessory piece) seen sideways. Mag. 1280.

8.Adult female of Rhabditis Perrieri: v, vulva; g, ovary; a, anus. Mag. 85.

9.Anterior end, mouth and buccal cavity. Mag. 700.

10.Esophagus: c, nerve ring; p, excretory pore. Mag. 335.

11.A, B. Female tail seen fullface and sideways: g, rectal glands; a, anus; p, lateral papillae. Mag. 335.

12.Egg at the two-blastomere stage. Mag. 335.

13.Male tail seen fullface, with its bursa, its papillae and its spicules. Mag. 705.

14.Spermatozoa. Mag. 1510.

PLATE XX

Fig. 1. Male tail of Rhabditis Perrieri seen sideways: i, intestine; c, deferent canal. Mag. 705.

2.Adult female of Rhabditis Guignardi: v, vulva; a, anus; g, ovary. Mag. 85

3.Anterior end, mouth and buccal cavity. Mag. 800.

4.Esophagus: c, nerve ring; p, excretory pore and its small canals; g, unicellular gland. Mag. 335.

5.Female tail seen sideways: g, rectal glands; a anus; p, lateral papillae. Mag. 335.

6.A, B. Male tail seen fullface and sideways: i, intestine; c, deferent canal; g, rectal gland. Mag. 395.

Fig. 7. Spicule and gubernaculum (accessory piece) seen sideways. Mag. 1460.

8.Spermatozoa. Mag. 1460.

9.Eggs. Mag. 335.

10.Adult female of Rhabditis Viguieri: v, vulva; g, ovary; a, anus. Mag. 150.

11.Anterior end, mouth and buccal cavity. Mag. 1280.

12.Esophagus: c, nerve ring; p, excretory pore. Mag. 390.

13.A, B. Male tail, bursa, papillae and spicules, seen fullface and sideways. Mag. 705.

14.Eggs of Rhabditis dolichura at the twoand four-blastomere stage. Mag. 335.

15.Spermatozoa of the same. Mag. 1510.

PLATE XXI

Fig. 1. Adult female of Rhabditis dolichura: v, vulva; g, ovary; a, anus. Mag. 150.

2.Anterior extremity, mouth and buccal cavity. Mag. 830.

3.Esophagus: c, nerve ring; p, excretory pore with its small canals. Mag. 395.

4.Female tail: r, rectum with its glands; a, anus. Mag. 395.

5.Anterior part of the intestine to show the arrangement of its nuclei and of its cells. Mag. 335.

6.Oviduct and seminal receptacle ov, vitellogen vi, and germigen g. Mag. 705.

7.A, B. Two genital organs at the time of their arrival at maturity. The first, A, beginning to produce the first spermatozoa; the second, B, having produced all its spermatozoa and maturing its first ova. Max. 705.

8.A, B. Tail, bursa and male spicules seen fullface and sideways: i, intestine; c, deferent canal; g, rectal glands. Mag. 705.

9.Female genital organ of Rhabditis coronata: v, vulva; u, uterus; r, seminal receptacle; ov, ovary; i, intestine. Mag. 800.

10.Egg of the same. Mag. 705.

11.Male tail of the same seen sideways; with its bursa, its papillae and its spicules. Mag. 705.

PLATE XXII

Fig. 1. Adult female of Rhabditis coronata: v, vulva and genital organs; a, anus. Mag. 335.

2.Anterior end, mouth and buccal cavity. Mag. 800.

3.Esophagus: c, nerve ring; p, excretory pore. Mag. 705.

4.Adult female of Diplogaster robustus: v, vulva; o, oviduct; g, ovary; a, anus. Mag. 84.

5.Vein and striations of the cuticle. Mag. 1460.

6.Anterior end, mouth and buccal cavity. Mag. 800.

MODES AND FORMS OF REPRODUCTION OF NEMATODES. 173

7.Esophagus: c, nerve ring; p, excretory pore and organ. Mag. 335.

8.Female tail: g, rectum and rectal glands; a, anus; p, lateral papilla. Mag. 335.

9.Genital organ of a young female: v, vulva and vagina; u, uterus still containing only two eggs; ss, spermatozoa; o, oviduct; g, ovary, in the front the vitellogen, in the rear the germigen. Mag. 188.

10.Eggs at the twoand four-blastomere stage. Mag. 335.

Fig. 11. Rhaphides of the testis. Mag. 1460.

12.Spermatozoa of male and female origin. Mag. 1460.

13.Spermatic nuclei treated with acetic acid and showing their twelve chromosomes. Mag. 1460.

2.Spicules and gubernaculum (accessory piece) seen sideways. Mag. 705.

3.Juvenile having just hatched: r, genital rudiment; p, excretory pore and nerve ring; a, anus. Mag. 335.

4.Anterior end, mouth and buccal cavity of the previous. Mag. 1460.

5.Genital rudiment of the same. Mag. 1460.

6.Adult female of Diplogaster minor: v, vulva and genital organs; a, anus. Mag. 150.

7.Anterior end, mouth and buccal cavity. Mag. 800.

8.Esophagus: c, nerve ring; p, excretory pore. Mag. 335.

9.Female tail: g, rectum and rectal glands; a, anus. Mag. 335.

10.Genital organs : v, vulva; u, uterus; o, oviduct (tuba); g, ovary. Mag. 150.

11.Egg at the two-blastomere stage. Mag. 335.

12.Parthenogenetic egg with a misshaped shell. Mag. 335.

13.Parthenogenetic egg of regular shape and content in the morula state. Mag. 335.

14.Anterior end, mouth and buccal cavity of Cephalobus dubius, race rotundata. Mag. 1510.

15.Anterior end, mouth and buccal cavity of the Cephalobus dubius, race apicata. Mag. 1510.

16.Tail of race apicata. Mag. 705.

PLATE XXIV

Fig. 1. Adult female of Cephalobus dubius: v, vulva; u, uterus; g, ovary; a, anus; p, excretory pore and nerve ring. Mag. 335.

2.Tail of race rotundata. Mag. 705.

3.Adult female of Cephalobus lentus: v, vulva; u, uterus; g, ovary; a, anus. Mag. 150.

4.Anterior end, mouth and buccal cavity. Mag. 1510.

5.Esophagus: c, nerve ring; p, excretory pore and small canal. Mag. 705.

6.Tail: m, lateral membrane; r, rectum and rectal glands; a, anus. Mag. 380.

7.Eggs: Mag. 335.

8.Juvenile having just hatched: g, genital rudiment; a, anus. Mag. 335.

9.Anterior end, mouth and buccal cavity of the same. Mag. 1510.

PLATE XXV

Fig. 1. Genital organ of Plectus cirratus: v, vulva and vagina; uu, the two uteri each containing five eggs; cc, oviducts with the cells showing the pseudo-spermatozoa; o, ovary; i, intestine. Mag. 335.

2.Adult female of Aphelenchus agricola; v, vulva; u, uterus; g, ovary; a, anus. Mag. 75.

3.Anterior end, mouth and stylet. Mag. 1510.

4.Esophagus: c, nerve ring; p, pore and excretory canal; e, posterior limit of the esophagus; i, narrow part of the intestine. Mag. 705.

5.Tail: m, lateral membrane; r, rectum; a, anus. Mag. 705.

6.Genital organ: v, vulva; u, uterus; o, ovary. Mag. 335.

7.Egg at the three-blastomere stage. Mag. 335.

8.Anterior end and mouth of Alaimus Thamugadi. Mag. 1460.

9.Tail of the same: d, intestinal diverticulum. Mag. 335.

PLATE XXVI

Fig. 1. Adult female of Alaimus Thamugadi: v, vulva and genital organ; a, anus. Mag. 150.

2.Esophagus: c, nerve ring. Mag. 335.

3.Egg at the four-blastomere stage. Mag. 335.

4.Adult female of Macrolaimus crucis: v, vulva; u, uterus; g, ovary; a, anus. Mag. 150.

5.Anterior end, mouth and buccal cavity. Mag. 1510.

6.Other anterior end, with lateral tooth in the buccal cavity. Mag. 1510.

7.Esophagus: c, nerve ring; p, excretory pore and organ. Mag. 105.

8 . Tail: r, rectum and rectal glands; a, anus. Mag. 705.

9.Genital organ: v, vulva; u, uterus; o, oviduct (tuba); g, ovary. Mag. 335.

10.Eggs. Mag. 335.

MODES AND FORMS OF REPRODUCTION OF NEMATODES. 175

MODES AND FORMS OF REPRODUCTION OF NEMATODES. 177

MODES AND FORMS OF REPRODUCTION OF NEMATODES. 179