360 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 2 



vesicle the posterior Yz of which is usually recurved, the anterior J^ glob- 

 ular; cirrus large, straight, wide, inflated, filling approximately Y2 cirrus 

 sac, with papillated inner surface, tapering to a short smooth muscular 

 portion near genital pore. The few prostatic cells are external to cirrus 

 sac near its base. Tubular external seminal vesicle extends to left of base 

 of cirrus sac usually overlapping the acetabulum. 



Ovary variable in shape, usually irregularly lobed and elongate; it 

 may be smooth and almost globular. A roughly triangular form is not un- 

 common. Seminal receptacle an elongate tube extending anterior to ovary 

 along left side of acetabulum. The uterus may extend as far posterior as 

 the posterior edge of the testes. Eggs few, yellow, thin shelled, 60 to 75 by 

 32 to 41 ;u,, usually 60 to 65 by 34 to 37 /a. Metraterm strongly muscular, 

 slender, slightly curved, overlapping acetabulum. Vitelline follicles pro- 

 fuse, filling most of body from phaiynx to posterior end, contiguous an- 

 teriorly and dorsally at level of esophagus and, if body is contracted, as far 

 forward as the oral sucker. They are dorsal to the ceca as well as inter- 

 and extracecal. They usually are not contiguous posteriorly but separated 

 by a region around the excretory pore. They do not extend to the lateral 

 edges of the body. Excretoiy pore conspicuous, dorsal, some distance an- 

 terior to posterior end, between the tips of the ceca; excretoiy vesicle ex- 

 tending straight forward to the ovary. 



Comparisons. P. monocanthi and P. vitellosum differ from P. spino- 

 sum in larger size, in multilobed ovaries, and in smooth rounded testes. 

 P. monocanthi also differs in that its suckers are of equal size and the vi- 

 telline lobes are separated anteriorly. P. vitellosum has more profuse vit- 

 ellaria, diagonal testes close together and postovarian, suckers of equal 

 size, and smaller eggs. P. scaphosomum has the vitellaria interrupted an- 

 teriorly, more undulating ceca, and a curved or coiled cirrus. P. symme- 

 trorchis is larger, has more rounded seminal receptacle, vitellaria inter- 

 rupted anteriorly, and more posterior extent of the uterus. P. patellare has 

 a different distribution of the vitellaria, more anterior genital pore, longer 

 cirrus, and more posterior extent of the uterus. 



Anisoporus eucinostomi, new species 

 (PIate36, figs. 32, 33) 



Hosts: Eucinostomus californiensis (Gill) (type host) 



Polynemus approximans Lay and Bennett 

 Location: Intestine 



