CLASS PELECYPODA 
135 
Type in U. S. N. M. Type locality, off entrance to San Diego Harbor, 
in 16-20 fathoms. 
Range. Known only from the type locality. 
Rochefortia golischi Dali, 1916. 
Proc. U. S. N. M., 52:412. 
Shell subquadrate, compressed, thin, white, very inequilateral; the 
anterior end very short, beaks low, 1 mm. behind the anterior end; 
posterior end rounded almost exactly like the anterior, base gently arcuate; 
surface polished, minutely concentrically rippled; prodissoconch visible; 
hinge weak, the resilifer large, obliquely inclined backward. Length, 6; 
height, 5.5; diameter, 2.5 mm. (Dali.) 
Type in U. S. N. M., No. 210876. Type locality, Station 2900, off 
Santa Rosa Island, California, in 13 fathoms. 
Range. Known only from the type locality. 
Genus SERRIDENS Dali, 1899. 
Shell oval, with two diverging teeth in each valve, the anterior being 
conspicuously shorter than the posterior, sulcated near the beaks, ligament 
situated in a groove between them. 
Type. Phistiphora oblonga Carpenter. 
Distribution. California coast. 
Serridens oblonga Carpenter, 1865. 
Plate 54, figs. 5, 6, 7, 8. 
Proc. Cal. Acad. Nat. Set ., 1865, p. 210. 
P. t. oblonga, parva, subquadrata, valde insequilaterali; parte antica 
fere nulla; marginibus, dorsalibus subrectis, fere rectangulatis, ventrali 
parum excurvato, postico rotundato; umbonibus antice flectis; lunula 
parva, concava; intus, v. sinistr., dent. lat. post, per totam longitudinem 
dorsalem decurrente, parte cardinali acuta, alte transversim sulcata; ant. 
secundum incurvato curto, serrato; cicatr. adduct, sub fines dentium sitis. 
Long., 0.14; lat., 0.10; alt., 0.06. 
Like a Tellitnya, with long marginal teeth, serrated near the hinge. 
(Carpenter.) 
Type in U. S. N. M.? Type locality, San Diego, California. 
Range. Puget Sound to Coronado Islands, Lower California. 
Genus PSEUDOPYTHINA Fischer, 1884. 
Shell rather large for the family, reniform with a coarse rugose 
periostracum; hinge with two projections of the right dorsal margin 
