GENUS OF PARASITIC GASTROPODS. IO3 



pouch provided with a few secondary branches. These pouches 

 probably are to be considered as representing the hepato-pancreas 

 of other molluscs though the component cells differ in scarcely 

 any essential respect from those of the main division of the 

 stomach. At several points in the pseudo-pallium structures 

 occur that strongly resemble the liver, but as they lack anj^ 

 definite connections it is impossible to claim that they were once 

 united with the digestive tract. 



The intestine presents the form of a cylindrical tube invested 

 with numerous circular and longitudinal muscles attached by con- 

 nective tissue and muscle bundles to the stomach and body wall. 

 Its epithelial lining consists of relatively slender cells whose 

 boundaries distally are difficult to determine owing to the large 

 quantities of highly vacuolated protoplasm they contain. The 

 outlet is guarded on each side by a large conical papilla covered 

 with a thick cuticle fashioned near its tip into several slender 

 filaments. 



The stomach contains a small quantity only of a finely granu- 

 lar substance so that it is impossible to gain any insight into the 

 methods of feeding and the nature of the food of this animal. It 

 is probable that the proboscis and tentacles may be protruded 

 through the external slit-like opening and organic substances may 

 be picked up from the ooze as its host crawls about. It appar- 

 ently absorbs little if any nourishment from its host though there 

 may be some interchange of gases. 



No sign of a heart exists in this species as is the case also with 

 Entoconcha. A clotted substance abounds in the lacunae among 

 the various organs which doubtless represents blood. Groups of 

 cells here and there may be corpuscles but their resemblance to 

 connective tissue cells renders the determination uncertain. 



As noted in a preceding paragraph respiration may be effected 

 to a slight degree through the general body surface in contact 

 with the coelomic fluid of the host. The chief respiratory organs 

 however appear to be the finger-shaped processes (Fig. \,p, PI. I.) 

 attached to the posterior end of the body. With the exception 

 of the hypodermal layer and a few muscle fibers passing in various 

 directions from wall to wall or attached throughout their entire 

 extent to the walls these organs are hollow and are probably 



