Ou Aspidogaster ringeus (Linton) and A. kemostonia n. sp. 249 



tliin muscular walls and a veij definite rather high cubical epi- 

 thelial liiiing-. The intestine is rather clnb shaped and runs back 

 dorsall}' to end blindly a short way behind the level of the posterior 

 edge of the ventral sucking diso. 



The nervons System shows quite distinct on either side of the 

 prepharyngeal tube quite close to the anterior end and embedded 

 in the dense body musculature in the form of ganglion masses 

 connected by a commissure and giving oif stout trunks to the 

 posterior part of the body. 



The excretory system consists of two thin walled canals which 

 run in the ventral portion of the body cavity backward into the 

 posterior part until they unite into a small sac and emptj^ at the 

 hinder end in the depression described above. 



There is but one testis which is relatively large and lies in 

 the ventral or onter tube of the body at the posterior level of the 

 sucking disc or even behind it. From this there is evidently a very 

 flne vas deferens which runs into the dorsal portion of the body 

 to empty into the much coiled seminal vesicle which in turn extends 

 forward to enter the muscular ejaculatory apparatus. This latter 

 is a thick w^alled muscular sac the outer layer of muscle being 

 longitudinal, the inner circular. Within this is a mantle of loosely 

 arranged cells surrounding an inner tube which itself has a covering 

 of longitudinal muscle fibers. This tube has what appears to be a 

 cuticular lining from which project inward curious shaggy, shred like 

 structures wiiich occupy much of the cavity. Anteriorly this cavity 

 is prolonged into a somewhat coiled tube, posteriorly it is flask 

 shaped and narrows to communicate with the seminal vesicle. The 

 coiled tube may be projected as a rather long thick walled structure 

 from the genital opening. Outside the whole sac there is an accu- 

 mulation of quite large pear shaped cells which may possibly represent 

 a sort of prostatic apparatus. 



The ovary lies near the middle of the body in the substance of the 

 tissue which forms the basis of the ventral sucking disc and is 

 thus ventral to the layer of musculature which divides the body 

 (Fig. B a and b). It is pear shaped and the ova can be seen to be 

 very immature at the distal part of the gland becoming larger and 

 more distinct as they approach the oviduct. This duct leaves the 

 ovary at its posterior end and curves directly forward so as to lie 

 parallel with the long axis of the ovary. It soon meets and opens 

 into a tube which then continues forward to pass through the shell 



