NO. 



14 MANTER: DIGENETIC TREMATODES OF FISHES 419 



1938 and P. harengulae Yamaguti, 1938 seem to me to be synonjons, 

 also. The short distance between the ovaiy and testes I have observed in 

 young individuals. P. atherinae is characterized by a wall of the seminal 

 vesicle which is "not very thick." The thickness of the wall of the seminal 

 vesicle varies greatly according to the volume of sperm cells within it. 

 One specimen from Florida had a completely empty vesicle and was 

 rounded (43 by 43 jx) with very thick walls (17 p.). P. harengulae has 

 eggs from 29 to 34 /a long, which is a little larger than the largest I have 

 seen in P. meruSj but the smaller size is within the limits of the latter 

 species. Perhaps the chief difference shown by P. harengulae is in the 

 dorsal denticulations reaching to the testes, but it is not made clear 

 whether they extend entirely across the dorsal surface at this level. 



P. sardinae and P. seriolae are also possibly synonyms of P. merus but 

 may be justified by the more posterior position of the ovary and the larger 

 ecsoma. In none of my specimens is the ovary so far posterior. 



There is thus indicated for P. merus a wide distribution from the 

 Gulf of Mexico into the South American Atlantic, in the American Pa- 

 cific, and probably in Japanese waters. Proposed synonyms are : P. para- 

 hemiurus, P. platichthyij P. atherinae, P. harengulae. Other species are: 

 P. australis, P. anchoviae, P. sardinae, P. seriolae, and a new species de- 

 scribed below. 



SPECIFIC DIAGNOSIS OF PARAHEMIURUS MERUS (LINTON) 

 Length 1.14 to 3, ecsoma usually extended. Body rings extending to 

 level of ovary or vitellaria on ventral side, but the middle of the dorsal 

 surface is not ringed posterior to the acetabulum. Acetabulum 2 to 2.5 

 times oral sucker. Ceca may or may not enter ecsoma. Genital pore oppo- 

 site posterior portion of oral sucker. Sinus sac extending beyond anterior 

 border of acetabulum sometimes to middle of this sucker ; pars prostatica 

 long, slightly coiled, extending some distance posterior to acetabulum; 

 seminal vesicle subspherical to ovoid, undivided, with muscular wall; 

 testes diagonal or tandem. Ovaiy transversely ovoid, separated by some 

 distance from posterior edge of body ; vitellaria unlobed or slightly 3- or 

 4-lobed ; uterus may or may not enter ecsoma; eggs 18 to 34 by 8 to 14 /x, 

 usually 20 to 27 by 9 to 12 /x. 



Parahemiurus ecuadori, new species 

 (Plate46, fig. 104) 



Host: Anchoviella sp. 

 Location: Stomach 



