341] PSEUDOPHYLLIDEA FROM FISHES— COOPER 53 



CYATHOCEPHALINAE LiJhe 1899, e.p. 



Scolex unarmed, not longer than broad, with two surficial sucking grooves, 

 more or less fused with one another, or a single terminal one having a sucker- 

 like structure. External segmentation little expressed or absent. Genital 

 organs in each segment simple. Genital openings surficial, median. Vagina 

 and uterus open into a common vestibule — in young proglottides near one 

 another — lying behind the male opening and similar to the genital atrium of 

 other cestodes, which may be surrounded by a sphincter-like musculature. The 

 genital openings of the different segments do not open on the same surface, 

 but alternate irregularly from one surface to the other. Uterus a coiled canal 

 without uterus-sac. Sexually mature in the intestines of fishes. 



Type genus: Cyathocephalus Kessler. 



The above is Liihe's (1910:22) diagnosis modified to read "may be sur- 

 rounded, etc." instead of "is surrounded, etc." in connection with the genital 

 sphincter, since there is no such structure in the species described below. 



CYATHOCEPHALUS Kessler 1868 



Scolex a single, undivided, terminal, sucking organ, which in its form and 

 structure no longer shows an origin from two fused surficial bothria. External 

 segmentation only slightly indicated. Sphincter surrounding the female 

 genital cloaca apparently little developed. Occurrence: In Teleosts. 



Type Species: C tnincatus (Pallas, 1781). 



CYATHOCEPHALUS AMERICANUS Cooper 1917 

 [Figs. 11, 82, 93, 99, 104] 

 ? 1898 Cyathocephalus truncatus Linton 1898:428 



1917 Cyathocephalus americanus Cooper 1917 : 35 



Specific diagnosis: With the characters of the genus. Small cestodes, up 

 to a length of at least 11mm. with a maximum breadth of 1.2mm. Scolex 



