Oü Aspidogaster ringens (Linton) and A, kemostoma n. sp. 255 



Tlie genital apparatus. The female geiiitalia lie as 

 atated in part, ventral to the muscular partition in the posterior 

 third of the body. The ovary is pear shaped with the smaller end 

 from which the oviduct arises pointed backward. In its anterior 

 or distal end the cells are quite small but as one approaches the 

 oviduct they become larger and compressed against one another 

 and assume the form of detinite ova. The oviduct turns back upon 

 itself and quickly joins the duct from the spermatheca or recepta- 

 culum seminis which is a long club shaped sac bent several times 

 upon itself and lying directly in front of the festes. No Lauker's 

 canal is described for this genus but in this form there is a rather 

 long narrow canal running from the oviduct to a papillary pro- 

 jection on tlie dorsal surface not far in front of the blind end of 

 the in testine, which we Interpret as such. 



The duct formed by the union of oviduct and the canal from 

 the receptaculum seminis receives the two Channels from the yolk 

 gland, and then gives rise to the thin walled uterus which runs in 

 coils past the festes to the posterior end of the body where it be- 

 comes more dorsal and with many foldings passes toward the an- 

 terior end of the body. It empties into a kind of cloaca which 

 opens as described above. The terminal portion is quite muscular 

 and opens rather anteriorly and to one side of the ejaculatory 

 apparatus. The eggs are elliptical, thick walled and yellow with a 

 sudden narrowing at one end. They measure 0,07X0,05. The 

 yolk gland extends on each side from about the middle of the 

 .sucking disc nearly to the extreme hind end of the body, It is in 

 the form of quite widely separated lobules. 



There is one relatively large elliptical testis which lies ventrally 

 uear the end of the intestinal trunk. It gives off a vas deferens 

 which penetrates into the dorsal part of the body, and there, at 

 about the level of the hin der end of the sucking disc it passes 

 into a much coiled thin walled seminal vesicle which at its anterior 

 ■end passes through a mass of large cells into the globular cirrus. 

 This cirrus lies in an indistinct cirrus sac and is very dense and 

 muscular. The large cells which immediately Surround it may pro- 

 bably be regarded as prostatic elements. The cirrus may be pro- 

 jected in the form of a small cylinder offen with knob like end. It 

 is quite short and apparently does not easily reach out of the 

 ■cloaca. 



Zool. Jahrb. XXXIV. Abt. f. Syst. 18 



