NO. 14 ^[anter: digenetic trematodes of fishes 335 



1932) to Dollfustrema. Nagaty considers Dollfustrema a synonym of 

 Prosorhynchiis. A gasterostome of this type has been collected by the 

 writer at Tortugas, Florida, and its study leads to the conclusion that the 

 anterior spines : night well be considered a generic character. However, 

 the genus ]\Ioid\ ilkovia Pigulewsky, 1931 has "conspicuous cuticula 

 folds" on the rh\ tichus in such a manner as to suggest the spines of Doll- 

 fustrema, and rhe writer is inclined to consider Mordvilkovia a valid 

 genus with Dollfustrema and Dollfusina as synonyms. 



The genus Pseudoprosorhynchus Yamaguti, 1938, with its intertes- 

 ticular ovarj', seems to be a synonym of Neidhartia Nagaty, 1937. 



In accordance with the above views, the following genera are rec- 

 ognized : subfamily Bucephalinae — Bucephalus, Bucephalopsis, Rhipi- 

 docotyle, Doliohoenterum; subfamily Prosorhynchinae — Prosorhynchus, 

 Alcicornis, Neidhartia, Mordvilkovia. 



Bucephalus various, new name 

 (PIate32, figs. 3-9) 



Synonym: Bucephalus polymorphus of Nagaty, 1937 



Host : A young specimen of an unidentified species of Caranx, 



or jack 

 Location: Stomach and intestine 

 Locality: Bahia Honda, Panama 

 Number: About 18 from a single host 



What is apparently the same species of Bucephalus, which Nagaty 

 records as B. polymorphus from several fishes (especially "Trachynotus" 

 and "Caranax" species) from the Red Sea, has been collected by me from 

 both the Atlantic and Pacific. My Atlantic specimens are from Caranx 

 ruber (Blocli). Caranx latus Agassiz, and Caranx bartholomaei Cuv. 

 and Val., all from Tortugas, Florida. The Pacific material is from a 

 "small yellow jack" taken at Bahia Honda, Panama. 



Nagaty idciuified his specimens as B. polymorphus. Comparing his 

 description and figures with those given by Eckmann for authentic B. 

 polymorphus, it >eems to the writer that sufficient differences exist for a 

 separate species, even assuming that seven tentacles are present in B. 

 polymorphus (6 are described). B. polymorphus is from fresh-water 

 hosts; the mouth is at midbody; the testes are oblique and the ovary 

 more or less lateral to the anterior testis; the cirrus sac is only i/^ 

 body length; the uterus extends well anterior to the vitellaria but is at 

 the same time very weakly developed posterior to the mouth, where there 



