Cotylogfuster occidentalis n. sp. ßl7 



Table for preliminary deterraination of gener a. 



1. Adhesive organ coniposed of uumerous more or less distinct ace- 

 tabula in a Single row. Marginal sense organs lacking. 2 testes 



Süchocotylc 



2. Adhesive organ composed of a Single row of confluent acetabuhi. 

 Sense organs present. 1 testis 3Iacraspis 



3. Adhesive organ elongated composed of 3 rows of alveoli, the 

 median transversely elongated and shallow, the lateral smaller and 

 rounded ; mouth terminal surrounded by an expanded buccal disk. 

 Sense organs present. 2 testes Cotylogaster 



4. Adhesive organ oval or elliptical, composed of 3 rows of alveoli ; 

 mouth subterminal not surrounded by buccal disk. Sense organs 

 present. 1 testis Cotylaspis 



5. Adhesive organ oval, 2/3 length of body, composed of 4 rows of 

 alveoli; mouth subterminal not surrounded by buccal disk. Sense 

 organs present. 1 testis Aspidogaster 



1. Genus: Stichocotyle Cunningham 1884. 

 Literature : Cunningham '84; '87. — Nickbrson '95. — Odhner '98. 



Body greatly elongated, cylindrical, anterior end flattened dorso- 

 ventrally, tapering in posterior third. Ventral side bearing a Single 

 longitudinal row of between 20 and 30 transversely elongated ace- 

 tabula encircling the ventral half of the body. Anterior acetabulum 

 circular, those near posterior end of series smaller and more or less 

 confluent. Sense organs lacking. Mouth subterminal at base of a 

 funnel shaped depression , not surrounded by a distinct sucker. 

 Pharynx medium, intestine simple tubulär extending nearly to posterior 

 end of body. Excretory pore dorsal, median, near posterior ex- 

 tremity. Genital aperture anterior to margin of first acetabulum, a 

 little to the right side. Eggs large oval. 2 testes. 



Adults live a parasites in the bile passages of the liver of rays; 

 larvae occur encysted in wall of intestine of the larger marine crustacea. 



The only species is 



S. nephropis Cunn. 1884. 



In bile passages of liver of species of Raja on coast of Europe 

 and N. America. 



