93] PROTEOCEPHALIDAE — LA RUE 93 



PROTEOCEPHALUS PERCAE (Miiller) 

 [Figs. 8, 9, 69-74, 120-122, 172, 173] 



Specific Diagnosis: Characters of the genus. Worms of varying 

 length, 20-200 mm. Maximum breadth 1.1-1.5-2.0 mm. Head short, 

 broad, flattened dorsoventrally, apex slightly elevated or flattened. At 

 summit a fifth sucker, muscular, 0.033-0.040-0.060 mm. in diameter. 

 Four suckers, muscular, with deep cavities, 0.085-0.100-0.137 mm. in 

 diameter, situated at broadest zone of head or immediately anterior 

 thereto. Head 0.192-0.357 mm. broad, usually about 0.300 mm. Thick- 

 ness of head 0.170-0.238 mm. Surface of head without furrows. Neck 

 0.170-0.50 mm. broad by 3.0-10.0 mm. long. Transition to first proglot- 

 tids imperceptible. First proglottids usually broader than long, 0.255- 

 0.34 mm. broad by 0.085-0.102 mm. long, rarely longer than broad. 

 Mature and ripe proglottids broader than long. Breadth of mature 

 proglottids 0.935-1.19-1.30 mm., length of same 0.255-0.340 mm. Breadth 

 of ripe proglottids 1.10-1.7 mm.; length of same 0.42-0.85 mm. End 

 proglottids about quadrate. Proglottids few, 150 or more, closely at- 

 tached. Segmentation fairly evident, angles of proglottid rounded. 

 Surface of worm wrinkled and rough. 



Genital organs as in genus. Genital aperture marginal, near mid- 

 dle of proglottid, irregularly alternating. Testes in single layer, irreg- 



