NO. 14 MANTER : DIGENETIC TREMATODES OF FISHES 421 



Dinurus longisinus Looss, 1907 



Host: Coryphaena hippurus Linn. 



Location: Stomach 



Locality: Secas Islands, Panama 



Number: Several 

 This species was in the same host with D. barbatus. Other immature 

 specimens of Dinurus were present but were not sufficiently developed 

 for specific identification. 



Elytrophallus mexicanus, new genus, new species 

 (Plate46, figs. 105-107) 



Hosts: Lutianus viridis (Val.) ? (type host) 



Paranthias furcifer (Cuv. and Val.) 



Epinephelus sp. 



Epinephelus labriformis (Jenyns) 



Caranx lugubris Poey ? 



Zalocys stilbe Jordan and McGregor 



Mycteroperca sp. 

 Location : Stomach 



Locality: All collections were from Socorro or Clarion Is- 

 land, Mexico, except for a few specimens from 2 

 Paranthias furcifer from James Island, Galapagos. 

 The trematode is very common at Socorro and 

 Clarion. Three of 4 specimens of P. furcifer con- 

 tained it in that region, but only 2 of 6 specimens of 

 this same host were infected in the Galapagos region. 



Number: Common in the above hosts at Clarion and Socorro 

 islands. Collected there 8 times. 



SPECIFIC DIAGNOSIS OF ELYTROPHALLUS MEXICANUS 



Body smooth, elongate, cylindrical, with protrusible ecsoma; body 

 itself 1.125 to 2.025 in length, tail may be extended up to 0.487 to make 

 a total length up to 2.323 ; greatest width 0.292 to 0.487, usually at ace- 

 tabular level, sometimes near posterior end of body. Forebody 0.232 to 

 0.435 (about 1/5 body length). Oral sucker subterminal, 0.090 to 0.127 

 in diameter. Acetabulum circular, 0.244 to 0.397 in diameter. Sucker 

 ratio close to 1 :3. Genital pore far anterior, median or submedian, ventral 

 to oral sucker, only a short distance posterior to mouth. Pharynx usually 

 slightly wider than long, 0.039 to 0.053 in length, 0.044 to 0.053 in 

 width; esophagus spherical, saclike, sharply defined, ventral, rather dis- 

 tinct from intestinal ceca which arise from its dorsal side ; ceca diverging 



