CLASS PELECYPODA 
99 
Cuspidaria chilensis Dali, 1889. 
Proc. U. S. N. M., 12:282; pi. 13, fig. 13. Bull. Mus. Comparative Zool. 43:433. 
Shell small, thraciseform, smooth, polished, greenish white, inequivalve, 
nearly equilateral, briefly rostrate; right valve larger, convex, rounded in 
front; beaks small, prominent, slightly incurved; neither lunule nor 
escutcheon present; posterior end strongly and suddenly compressed, the 
compressed portion bounded in front by a depressed ray extending from 
the beak to the posterior basal margin; posterior end short and rounded, 
somewhat narrower than the anterior; left valve similar but smaller and 
less convex, at the posterior hinge line underlying the margin of the 
right valve; hinge with small roundish projecting chondrophore which 
extends under the margin of the left valve to which it is united by the 
resilium; there is no ossiculum; the periostracum is papery and caducous, 
visible chiefly at the posterior and basal margin. Length, 6; height, 4.5; 
diameter, 2.7 mm. (Dali.) 
Type in U. S. N. M., No. 110582. Type locality, U. S. S'. Albatross 
Station 4654, northwest of Aguja, Peru. 
Range. Off Oregon in 277 fathoms to the coast of Chili in 1036 
fathoms. 
Cuspidaria nana Oldroyd, 1918. 
Plate 13, figs. 8, 9. 
Nautilus, 32:28. 
Shell small and slender; subventricose, the surface sculptured with 
numerous fine concentric lines of growth; the umbo anterior to the middle 
of the shell. Anterior portion obese, posterior slender, prolonged and 
slightly twisted, not gaping; with a sulcus reaching from the umbos to 
the rear of the shell. Hinge with no lateral teeth, a small anterior cardinal 
in the right valve, ligament obsolete, internal resilium strong, set in a 
prominent, posteriorly inclined resilifer with a strong quadrate lithodesma 
immediately in front of it. Pallial sinus short, rounded, margins entire. 
Length, 25; height, 13; diameter, 10 mm. (I. S. Oldroyd.) 
Type in Oldroyd Collection, Stanford University, No. 38. Type 
locality, Monterey, California. 
Range. Bolinas to Monterey, California. 
SECTION CARDIOMYA A. Adams, 1864 
Cuspidaria planetica Dali, 1908. 
Bull. Mus. Comp. Zool., 12:296. 
This species has a generally similar aspect to C. pseustes, but differs 
as follows: the rostrum is less constricted at the proximal end, so that 
