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PROCEEDINGS OP TEE NATIONAL MUSEUM. 



VOL. 50. 



of the genital glands; the ovaries and oviducts are represented by a 

 narrow strand 1.4 mm. long, translucid and without reserve granules. 

 The two receptacula seminis are 150 jx long and 

 G5 [/. thick and are distended with spermatozoa. 

 The two parallel uteri are 600 [x long and are 

 empty. The musculo-epithelial first portion of 

 the ovijector is 1 mm. long and unites the uterus 

 and a vestibule with a thick internal cuticular 

 lining; this portion of the o^djector and the 

 vestibule have a remarkably large development 

 of the external muscular layer. The vagina is 

 prolapsed to a distance of 125 [jl. The ovijector 

 extends along the everted vagina to its distal ex- 

 tremity. In an exceptional female the vagina is 

 not everted ; it has the form of a truncated cone 

 and the ovijector opens into it on the summit of 

 a rounded nipple (fig. 88). AVhen the female has 

 attained its final size, the ovaries are completely 



t^^^M developed but there are no eggs in the uterus. 



^^^ The fertilized eggs gradually make their way to 

 \«Sffia3,\ |.|^g uteri ; the latter elongate considerably, and in 

 the female which is completely mature they are 

 distended with eggs disposed in four or five rows 

 and occupying almost all of the body cavity 

 posterior of the esophageal bulb to the anal re- 

 gion. The eggs (fig. 89) are thick shelled, flat- 

 tened on one side, 75 to 80 [x long and 20 to 30 pi 

 thick, and are oviposited in the morula stage. 

 IJost. — Ctenodactylus gundi. 

 Location. — Cecum. 

 Locality. — Bou Saada, Algeria. 

 Seurat calls the phenomenon of precocious 

 copulation between a mature male and an im- 

 mature female "progamic," and notes that this 

 progamy is rather common among nematodes. 

 He notes it as occurring in species of Tropidocerca^ 

 which have enormous seminal receptacles; in 

 Dispharagus invaginatus Linstow, where after 

 copulation the vulvar region invaginates to the 

 interior of a cylinder formed by a cuticular fold, which prevents fur- 

 ther union; and notes as a most curious example Maupasina weissi 

 Seurat, in which, after copulation, the J^oung female secretes a very 

 prominent blackish cuticular ring which seals the vulva. In this 



£ 

 E 



Fig. 86.— Oxyukis hil- 

 GEETi. Female. 

 After Seukat, 1915. 



