DIGENETIC TREMATODES — MANTER AND VAN CLEAVE 325 

 Genus PLAGIOPORUS Stafford, 1904 



PLAGIOPORUS ISAITSCHIKOWI (Layman. 1930) Yamaguti, 1938 



Host.—Paralabrax clathratus (Girard),=* kelp bass. 



Location. — Intestine. 



Discussion.— Three specimens, in only fair condition and show- 

 ing only a lateral view, are identified as this species. They agree 

 with Yamaguti's description in such characteristic details as vit- 

 ellaria interrupted opposite acetabulum; testes tandem; genital 

 pore opposite pharynx; uterus extending to posterior edge of an- 

 terior testis ; ceca ending a little beyond posterior testis. However, 

 the cirrus sac extends to a little past midacetabular level (rather 

 than ending close to anterior border) and the largest eggs in 

 utero were 48 by 34/. as compared with 57 to 63^ by 38 to 40^ 

 described for P. isaitschikotvi. Contraction of the f orebody might 

 affect somewhat the posterior extent of the cirrus sac. The dif- 

 ference in egg size is considerable, but Yamaguti does not state 

 whether his measurements were from preserved specimens. The 

 sucker ratio on our specimens could not be determined because 

 of the lateral view. P. isaitschikowi has been previously reported 

 from Sebastiscus albofasciatus, from Suruga Bay, Japan, and from 

 Peter the Great Bay. 



Genus OPECHONA Looss, 1907 



OPECHONA ORIENTALIS (Layman. 1930) Ward and Fillingham, 1934 



Plate 13, Figures 11, 12 



Host.—Girella nigricans (Ayres),=^ common opaleye. 



Location. — Intestine. 



Number. — Several specimens, some immature. 



Discussion.— These trematodes agree well -with those reported 

 from Parayithias furcifer, a "small mackerel," and Angelichthys 

 sp., from the Mexican coast and the Galapagos Islands (Manter, 

 1940) . A young specimen shows that the "branch of the excretory 

 vesicle" on the left side of the body actually is represented on both 

 sides (pi. 13, figs. 11, 12). When swollen, these lateral trunks or 

 tubes (It) are fairly conspicuous, extending from near the in- 

 testinal bifurcation to a short distance posterior to the testes where 

 each seems to have an inconspicuous union with the excretory 

 vesicle (ex, fig. 12). The median trunk of the excretory vesicle 

 (mt) extends forward ventral to the intestinal bifurcation to end 

 just posterior to the pharynx. It often contains round, deeply 

 staining concretions. However, this median tube is separated by a 

 narrow constriction from that portion of the vesicle posterior to 



' New host record. 



