374 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 2 



Seminal receptacle a large, elongate sac, the posterior end of which may 

 overlap ovary. Vitellaria from posterior end of pharynx to posterior end 

 of body, interrupted opposite acetabulum, confluent or almost so dorsally 

 anterior to acetabulum; in hindbody follicles are chiefly lateral, median, 

 and ventral to ceca with very few dorsal follicles. Eggs yellow, thin- 

 shelled, 54 to 68 by 31 to 36 [x. Excretory pore terminal immediately dor- 

 sal to anus ; excretory vesicle extending dorsal to testes to level of ovary. 

 Comparisons. This species differs from all others in the genus {O. 

 scorpaenae Manter, O. helicoleni Manter, O. theragrae Lloyd) in much 

 more anterior extent of vitellaria. Other specific characters could be 

 noted. The genus Opecoelina is to be separated from Opecoelus and Ope- 

 gaster by the presence of a seminal receptacle. 



Cymbephallus carangi Yamaguti, 1938 

 (Plate 38, figs. 48-50) 



Host: Selar crumenophthalmus (Bloch) 

 Location : Intestine 

 Locality: La Plata Island, Ecuador 

 Number: 7 specimens in one host 



These specimens agree with Yamaguti 's description of C. carangi in 

 all details except egg size, which was 42 to 54 by 26 to 31 [x rather than 

 60 to 72 by 33 to 35 fx. The acetabulum was not extended but a retracted 

 peduncle is apparently present. Sometimes the acetabulum is pulled back 

 into the body. There is agreement with Yamaguti's material in such de- 

 tails as sucker ratio, location of genital pore, size of pharynx and esopha- 

 gus, shape of gonads, and distribution of vitellaria. The hosts are related. 



Measurements on my material are: length 1.575 to 2.632; width 

 0.292 to 0.405; forebody about i/6 body length; oral sucker 0.142 to 

 0.195; acetabulum 0.150 to 0.195; ratio about 1 :1. Eggs 42 to 54 by 26 

 to 31 II, blunter at one end, without knob. 



Parvacreadium bifidum, new genus, new species 

 (Plate38, figs. 51-55) 



Host: Identified only as a goby 

 Location: Intestine 

 Locality: James Island, Galapagos 

 Number : 5 specimens from a single host 



