416 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 2 



It is the present view of the writer that Siphoderinae Manter, 1934, 

 Neochasminae Van Cleave and Mueller, 1932, Cryptogoniminae Os- 

 born, 1903, and Exorchiinae Yamaguti, 1938 are all synonyms of Hetero- 

 phyinae Ciurea, 1924. 



Siphoderoldes vancleavei, new genus, new species 

 (Plate45, figs. 101, 102) 



Host: Orthostoechus maculicauda Gill 

 Location: Intestine 

 Locality: Port Utria, Colombia 

 Number: One specimen 



The status of this trematode should be qualified by the limitations 

 of a single specimen. This specimen is, however, favorable to show most 

 of the significant features with the exception of the exact length of the 

 ceca. The trematode is evidently a heterophyid similar to Siphodera and 

 Siphoderina but is distinctive in possessing a conspicuous, muscular gono- 

 tyl posterior to the acetabulum. 



SPECIFIC DIAGNOSIS OF SIPHODEROIDES VANCLEAVEI 



Body more or less flattened, entirely spined, broadly rounded at each 

 end, posterior end broad and scarcely tapering at all, anterior end only 

 slightly tapering; length 1.485 ; width 0.585. Forebody 0.427 or between 

 Yz and y^ total body length ; pigment granules in forebody. Oral sucker 

 0.180 in transverse diameter, without oral spines; acetabulum 0.075, 

 embedded in body; sucker ratio about 5:2. Gonotyl (fig. 102) with 

 transverse aperture, immediately posterior to acetabulum, with semi- 

 circular muscles. Acetabulum with 2 lateroposterior muscles extending 

 diagonally backward into the body. Prephaiynx short; pharynx 0.102 

 long by 0.087 wide; esophagus short; bifurcation midway between 

 pharynx and genital pore; ceca extending posterior to testes but not 

 reaching posterior end of body, probably ending shortly behind the testes. 

 Genital pore (fig. 102) median, immediately anterior to acetabular aper- 

 ture, not on surface of body but within the body fold which enfolds 

 acetabulum. Testes 2, lateral, far apart, in posterior half of body about 

 midway between acetabulum and posterior end of body, elongated, un- 

 lobed, extracecal, partly covered ventrally by uterus. Seminal vesicle 

 large, saclike, apparently undivided, from anterior edge of acetabulum 

 almost to ovary; prostatic vesicle short, at anterior edge of acetabulum; 

 cirrus and cirrus sac lacking; genital atrium tubular, muscular. 



