NO. 14 MANTER : DIGENETIC TREMATODES OF FISHES 387 



acetabulum, shape of gonads, extent of vitellaria, and size of eggs. There 

 was a tendency for the vitellaria to reach slightly more than halfway from 

 the ovary to the acetabulum, but in no case did they reach the acetabulum 

 and in no case farther than has been observed in H. torta. It is of interest 

 to note that the host is Epinephelus, the same genus as the hosts of this 

 trematode at Tortugas, Florida. 



Helicometra sinuata (Rud., 1819) 



Host: Moray 



Location: Intestine 



Locality : Port Culebra, Costa Rica 



Number: One specimen from one host 



This species is previously known only from Europe, where it occurs in 

 Trachinus draco and Ophidiitm imberbe (= Fierasfer imberbis). Its oc- 

 currence in the Pacific is unexpected. Although only one specimen was 

 collected, there can be little doubt as to its specific agreement with H. 

 sinuata. The measurements are : length 2.29, width 0.75, forebody 0.49, 

 oral sucker 0.18, acetabulum 0.26, eggs 46 to 53 by 19 /x. The body is 

 elongate, broadly rounded posteriorly. The testes are not lobed, although 

 not perfectly spherical. The posterior testis is subtriangular; the anterior 

 testis is transversely extended. The vitellaria are distributed exactly as in 

 H. sinuata and are interrupted opposite the acetabulum. Palombi (1929) 

 has given a list of synonyms and a discussion of H. sinuata. 



Helicometra fasciata (Rud., 1819) 



Hosts and Localities : Flounder from Tenacatita Bay, Mexico 



Unidentified stargazer from Santa 

 Maria, Mexico 



Location: Intestine 



Number : One specimen from each of the above hosts 



These specimens agree well with the characteristics of H. fasciata as 

 limited by Palombi (1929). The specimen from the flounder is almost 

 typical, but the one from the stargazer possessed somewhat oblique testes 

 and rather large eggs. 



Helicometrina nimia Linton, 1910 

 (Plate 40, fig. 69) 



Host: Paralabrax nebulifer (Girard) ?, kelp bass 

 Location: Intestine 



