, 
ee 
length 3, height 2.9, diameter 1.7 mm. Named in honor of Mrs. 
Paula Ball, of Los Angeles, Cal. 
_ 21:0108 Erycina chacei Dall. Off So. Coronado I., Baja Cal. 
Shell small, compressed, rounded-quadrate; nearly equilat- 
eral, anterior end slightly shorter; beaks low, pustular, minute; 
dorsal margin nearly straight, basal margin gently arcuate; sur- 
face finely concentrically striate, whitish under a pale ashy ver- 
jostracum, both ends nearly evenly rounded, hinge very feeble; 
length 5.3, height 3.5, dameter 1.8 mm. This may prove to be a 
Pseudopythina. Only one right valve was obtained. Named in 
honor ot Mr. and Mrs. BE. P. Chace, of Los Angeles, Cal.” Santa 
Rosa, Island, Cal. 
21:0109 Erycina santarosae Dall. S. Rosa I., Cal. 
Sheil small, compressed, whitish, with a thin pale brownish 
dull periostracum; profile approaching E. balliana but more elon- 
gated, and surface smooth, almost polished and without the mi- 
croscopic concentric sculpture; evenly ovate, nearly equilateral, 
the anterior end a trifle shorter; beaks low, pustular, the pro- 
dissoconch very small but distinct; length 4, height 3.5, diameter 
1.5 mm. 
21:0110 Aniscdonta? pellucida Dall. Monterey bay, Cal. 
Shell minute, white, pellucid, rounded triangular, smooth end 
polished; beaks prominent, dorsal slopes convexly arcuate be- 
hind, straighter in front; base arcuate, valves moderately arcuate 
with entire margins; hinge with developed anterior and posterior . 
laterals and Z cardinals, the anterior tooth bifid; length 2.8, 
height 2, diameter 1.38 mm. 
21:0111 Rochefortia ferruginosa Dall. 
Shell small, white, thin, subdonaciform, compressed, invari- 
ably coated with a ferruginous layer like some species of Axinulus, 
inequilateral; anterior side longer, apical angle about 90; both 
ends rounded, bace arcuate; length 4.5, height 3.25, diameter 
1:5 mm. Santa Rosa Island, to San Francisco bay, Cal. 
21:0112 Rochefortia beringensis Dall. Bering Sea. 
21:0113 Rochefortia grebnitzskii Dall. Bering Sea. 
21:0114 Rochefortia golischi Dall. Off S. Rosa I., Cal. 
Shell subquadrate, compressed, thin, white, very inequilat- 
eral; anterior end very short, beaks low, I mm. behind the an- 
terior end; posterior end rounded almost exactly like the anter- 
ior, 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. Named in honor of Mr. W. H. Golisch, of Los Angeles, Cal. 
21:0115 Pesudopythina myaciformis Dall. 
Commensal with crustacean, Puget Sound. 
21:0116 Cardium (Trigoniocardia) endoxia Dall, 
Catalina Island, Cal., to Gulf of Cal. 
21:0117 Protocardia paziana Dall. Off La Paz. 
21:0118 Cardium dulcinea Dall. Cent. Amer. 
21:0119 Saxidomus giganteus brevis Dall. Alaska. 
