NO. 14 MANTER : DIGENETIC TREMATODES OF FISHES 371 



tent of the seminal vesicle, and location of intestinal bifurcation. In most 

 of my specimens the testes were considerably extended transversely, but 

 this character was variable and some specimens were much like Yama- 

 guti's in this character. Although most specimens showed 3 large and 2 

 small lateral papillae on each lip of the acetabulum, a few showed these 

 structures inconspicuously, thus agreeing with Yamaguti's description of 

 "inconspicuous papillae." The seminal vesicle may barely overreach the 

 acetabulum, or it may extend to the posterior edge. The anus is practical- 

 ly terminal and opens with the excretory vesicle into a common terminal 

 depression. 



Two specimens of a trematode from Selar crumenophthalmus from 

 Bahia Honda are almost certainly the same species or at least the same 

 species as that from the Galapagos. They accidentally became dried but 

 were mounted and agreed in all characters above except for more rounded 

 testes. 



Goitocaecum tropicum, new species 



(Plate 37, figs. 44, 45) 



Host Locality Number 



Halichoeres dispilus (Giinther) Charles Island, Galapagos 2 



(type host) (type locality) 



Bathygobius soporator (Cuv. Socorro Island, Mexico 1 



and Val.) 



Bathygobius soporator Charles Island, Galapagos 6 



Malacoctenus zonifer Corrientes Bay, Colombia 2 



(Jordan and Gilbert) 



Blenny Charles Island 3 



Opisthognatkus scops Galapagos Islands 4 



(Jenkins and Everman) 



Location : Intestine 



SPECIFIC DIAGNOSIS OF GOITOCAECUM TROPICUM 



Body smooth, elongate, flattened, rather abruptly pointed at posterior 

 end, forebody more gradually narrowing. Length 0.780 to 1.140; great- 

 est width (just posterior to acetabulum) 0.277 to 0.465 ; forebody usual- 

 ly about ^ body length, 0.227 to 0.427 in length. Oral sucker slightly 

 longer than wide, 0.088 to 0.135 wide; acetabulum wider than long, 

 0.165 to 0.277 in width, with transverse aperture. Sucker ratio approxi- 

 mately 1 :2 (more often the acetabulum is a little less than twice the di- 

 ameter of oral sucker). Prepharynx short and wide; pharynx globular or 



