377] 



PSEU DOPEY LLIDEA FROM FISHES— COOPER 



FISTULICOLA PLICATUS (Rudolphi 1819) 



89 



Specific diagnosis: With the characters of the genus. Large cestodes with 

 maximum length, breadth and thickness of 250 (about 60 when contracted), 

 20 and 5mm. respectively. Scolex somewhat orbicular, 2mm. long, 1.3 wide 

 and 1.8 thick; present only in young strobilas which are free in the intestine 

 of the host; later it becomes modified as does a considerable portion of the 

 anterior end of the strobila to form a pseudoscolex which is found deeply im- 

 bedded in the wall of the host's rectum or completely piercing it. Segmenta- 

 tion begins immediately behind the scolex or pseudoscolex. First and middle 

 segments very short and broad, with prominent posterior and wavy borders; 

 posterior joints 0.4, 7 and 3mm. in length, breadth and thickness respectively, 

 furmel-shaped with prominent posterior borders which occupy two-thirds 

 or more of the transverse diameter; terminal segments relatively much longer, 

 narrower and conical in shape, their posterior margins very thin and leaf-like. 



