NO. 14 MANTER : DIGENETIC TREMATODES OF FISHES 389 



muscular bands (fig. 70). Anterior muscular lip 0.153 in diameter, pos- 

 terior muscular Up 0.110 in diameter. Prepharynx lacking; phar>'nx 

 0,940 long by 0.110 wide; esophagus short; very wide ceca. Genital pore 

 slightly to the left at posterior end of pharynx. Testes subspherical, 

 smooth, tandem, close together, in posterior half of body. Cirrus sac mus- 

 cular, thick walled; spindle shaped with anterior narrow portion bent 

 ventrally, posterior portion (dorsal to acetabulum) narrowing almost to 

 a point, containing in basal portion a broad, tubular, internal seminal vesi- 

 cle, in middle portion a spherical prostatic vesicle, and terminally a 

 muscular cirrus. A narrow seminal tube widens opposite posterior fourth 

 of acetabulum to form a broad, tubular, external seminal vesicle ending at 

 anterior border of ovary. Just posterior to acetabulum, dorsally on each 

 side occurs a group of gland cells interpreted by Yamaguti in L. semicos- 

 syphi as prostatic cells. Male system almost exactly as in L. semicossyphi 

 except for greater coiling of external seminal vesicle. Ovary subspherical, 

 smooth, at right anterior border of anterior testis not far posterior to ace- 

 tabulum; seminal receptacle flask shaped, lying transversely and dorsally 

 across posterior half of ovary ; yolk reservoir to left of ovary ; uterus pre- 

 ovarian; eggs 58 to 60 by 26 to 31 ^i; vitelline follicles from level of in- 

 testinal bifurcation backwards, lateral to and anterior to acetabulum 

 they are ventral to ceca, but posterior to that level they surround the ceca. 

 Excretory system not seen. 



The name secundus indicates the second-named species in the genus. 



Comparisons. This species differs from L. semicossyphi chiefly in the 

 more anterior extent of the vitellaria. Since Yamaguti had numerous 

 specimens of L. semicossyphi in which the vitellaria usually did not reach 

 the acetabulum and never beyond its posterior border, this character can 

 be considered specific. Other minor differences seen in L. secundus seem 

 to be : less conspicuous acetabulum, shorter uterus, coiled external seminal 

 vesicle, and wider ceca. 



Discussion. The very close resemblance of this species to L. semicos- 

 syphi at once suggested a comparison of the hosts involved. These fishes do 

 prove to be related, both being in the family Labridae. The trematodes, 

 however, are more similar than the hosts, presumably, since the parasites 

 can scarcely be distinguished specifically while the fishes are in different 

 genera. The indicated interhost connections, therefore, are Pacific rather 

 than Atlantic. L. semicossyphi is from the Inland Sea, Japan. 



There can be no doubt that Labrifer is related to the genus Myzo- 

 xenus Manter, 1934. Both possess similar muscular lips on the acetab- 



