420 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 2 



Locality: San Francisco, Ecuador 



Number: 4 or 5 specimens from a single host 



The following diagnosis is based on 2 specimens. The smaller was 

 not quite mature. 



SPECIFIC DIAGNOSIS OF PARAHEMIURUS ECUADORI 



Body cylindrical, ecsoma well developed, partially or wholly extend- 

 ed, denticulations or rings extend along entire length of body; total 

 length 1.012 to 1.147; body length 0.825 to 0.862; tail on 0.862 body 

 extended (fully) 0.322. Greatest width 0.150 to 0.200. Oral sucker 

 0.090 to 0.102; acetabulum 0.083 to 0.087; sucker ratio about 5:4; 

 forebody y^ to Yq body length. Phaiynx elongate and cylindrical, length 

 almost 3 times width, 0.085 to 0.102 by 0.034 to 0.042; esophagus 

 a short thin-walled sac; ceca extend anteriorly then backward into the 

 ecsoma to near its posterior tip. Genital pore ventral to oral sucker. Tes- 

 tes rounded, diagonal, almost tandem; anterior testis about in middle of 

 hindbody; seminal vesicle postacetabular, a large elongate sac, undivided, 

 thick walled, 0.178 by 0.065 in the mature specimen; pars prostatica 

 S shaped, somewhat shorter than seminal vesicle; sinus sac a slender 

 elongate muscular tube, 0.170 in length (in mature specimen), extending 

 to midacetabular level. Ovaiy in posterior half of hindbody; vitellaria 

 two large, compact, unlobed masses, side by side, immediately postovar- 

 ian, near posterior end of body ; seminal receptacle small ; uterus extends 

 into ecsoma; eggs 14 to 15 by 7 /x. 



Discussion. The rapid growth of the genus Parahemiurus dispels any 

 doubt as to its validity once questioned by the writer (Manter, 1934, p. 

 304). P. ecuadori is easily distinguished from all the other species by the 

 fact that the oral sucker is larger than the acetabulum and by its very 

 elongate pharynx. These two characters are so distinct that no further 

 comparisons are necessary. 



Dinurus barbatus (Cohn, 1902) 



Host: Coryphaena hippurus Linn. 

 Location: Stomach 

 Locality: Secas Islands, Panama 

 Number: Several 



These common trematodes of Coryphaena occurred in a host only 10 

 cm in length. 



