DIGENETIC TREMATODES — MANTER AND VAN CLEAVE 317 



(== Distomum veliporum of Sleggs) from Raja bituberculata^ at La 

 Jolla, and a hemiurid, which he called Distomum appendiculatum, 

 from Paralichthys calif ornicus, presumably also from La Jolla. 

 This latter species is too incompletely described to permit of its 

 identification. In the present study an immature hemiurid from 

 the same host could not be identified as to genus. 



Order GASTEROSTOMATA 

 Family BUCEPHALIDAE 



Genus BUCEPHALOPSIS Baer, 1855 



BUCEPHALOPSIS LABIATUS. new species 



Plate 12, Figures 1, 2 



Description (measurements based on nine specimens). — Small, 

 ovoid gasterostomes, 0.635 to 0.745 mm. long by 0.234 to 0.328 

 mm. wide, widest near anterior end. Anterior sucker (as) 0.127 

 to 0.146 mm. in transverse diameter. Mouth posterior to midbody, 

 usually about two-thirds body length from anterior end, with a con- 

 spicuous anterior oral lobe or lip (ol). Pharynx (ph) ovoid, wider 

 than long, 0.071 to 0.080 mm. in transverse diameter; esophagus 

 extending anteriorly, gradually widening to become the cecum 

 (ic), which curves backward from near posterior edge of ovary 

 so that the digestive system is inverted U-shaped, ending slightly 

 anterior to level of the mouth. Testes (t) ovoid, diagonal; anterior 

 testis approximately at midbody level and mostly anterior to 

 mouth. Cirrus sac (cs) long and slender, almost uniform in width, 

 extending anterior to mouth to midbody or beyond ; 0.314 to 0.360 

 mm. long by 0.066 to 0.073 mm. wide; seminal vesicle an ovoid 

 sac 0.076 to 0.078 mm. long by 0.046 to 0.070 mm. wide; atrial 

 tube moderately long, 0.060 to 0.087 mm.; genital pore ventral, 

 near posterior end of body. Ovary (ov) globular, immediately 

 anterior to anterior testis; vitelline follicles (v) fused to form 

 two irregular longitudinal masses at ovarian level, meeting near 

 anterior end of ovary, diverging slightly posteriorly, usually seem- 

 ing to be displaced toward one side of the body; vitelline duct 

 from each mass extends posteriorly to meet near intertestis level 

 and some distance posterior to ovary; uterus (ut) extends an- 

 teriorly near right edge of body from near union of yolk ducts, 

 reaching to anterior sucker, extending posteriorly to right of 

 ovary, a short metraterm leads to the genital atrium (ga). Un- 

 collapsed and normal eggs 25 to 31/i by 16 to lip.. Excretory pore 

 terminal ; excretory vesicle (ex) extending to near base of anterior 

 sucker. 



- Probably a lapsus calami for Raja hi-ruocdata. 



