Cotylogaster occidentalis n. sp. 



601 



by only a few scattered circular fibres which may occasionally be re- 

 cognized about the posterior portion of the intestine. 



MoNTiCELLi has described the intestine of C. michaelis as being 

 much enlarged posteriorly to form a varicose sack. It seems ex- 

 tremely improbable that any State of contraction of the body could 

 bring about such a condition of the intestine of C. occidentalis. It 

 is much more probable that there is in this respect a real difference 

 between the two forms. 



The only food material observed in the intestine was a small 

 number of blood corpuscles. 



The opening of the excretory System is at the posterior end of 

 the body just above the edge of the ventral shield and at the base 



Fig. A. 



of the dorsal cone (Fig. 7). There is here an invagination of the 

 body wall forming a tubulär depression into the base of which two 

 small pores open laterally, one froni each of the two excretory 

 vesicles. These vesicles are extremely thin walled resembling mere 

 cavities in the parenchyma and are quite unconnected with each other. 

 I have not traced the course of the tubules which empty into them. 

 One peculiar feature of the excretory System deserves special 

 mention. An elongated rather deeply staining structure is very clearly 

 to be Seen in the total preparation mentioned extending for some 

 distance od either side of the prepharynx just back of the oral disk 

 (Fig. 15 ex.t). Sections show this to be a tubule having thick walls 

 containing large nuclei but not showing cell outlines. The lumen of 

 the tubule is irregulär in outline and has an average diameter of about 

 6 or 7 ^«. The length of the enlarged portion of the tubule is a little 



