ARNOLD] FOSSIL MOLLUSKS FROM CALIFORNIA 439 



Type.— Cat. No. 165,245, U. S. N. M. 



Locality. — Bath-house Beach, Santa Barbara, California. (Delos 

 and Ralph Arnold.) 

 Horizon. — Fernando formation (Pliocene or lower Pleistocene). 



PUNCTURELLA DELOSI, new species 

 PL LVII, fig. 5a and 56 



Description. — Shell minute for one of this genus ; body of shell 

 roughly cylindrical, the cross-section of base being broadly elliptical, 

 tapering off above into a coiled apex, the coil being right-handed and 

 of about iy 2 turns; a narrow slit about 0.7 mm. long perforates the 

 shell in front of the apex and truncates one of the radiating ribs. 

 The axis of the slit is parallel with the longer axis of the elliptical 

 base. The sculpture consists of (in the type 23) prominent equal, 

 equidistant, rounded, raised ridges, which radiate from the apex 

 toward the periphery or base ; near the apex these ridges are quite 

 sharp. The interspaces are slightly narrower than the ribs and are 

 crossed by numerous sharp raised lamellae of growth which flex 

 forward and give the surface a cancellated appearance. These 

 lamellae also cross the radiating ribs, giving them an imbricated or 

 nodose surface. The lamellae are more numerous on the anterior or 

 cylindrical part of the shell. The interior of the shell is smooth. A 

 raised border or septum associated internally with the slit divides 

 the shell near the apex, crossing parallel with the narrow axis of the 

 base. 



Dimensions. — Altitude, 1.8 mm.; longer diameter of base, 1.8 

 mm.; shorter diameter, 1.6 mm. 



Notfs. — This species of Puncturella is very much smaller than 

 any other from the West Coast. Its shape is also quite distinctive 

 and its ribs equal in size rather than alternating or subequal, as in 

 the previously described forms. Two specimens only were found at 

 the type locality. Named in honor of Delos Arnold, of Pasadena, 

 California. 



Type.— Cat. No. 165,234, U. S. N. M. 



Locality. — Bath-house Beach, Santa Barbara, California. (Delos 

 Arnold.) 



Horizon. — Fernando formation (Pliocene or lower Pleistocene). 



VENERICARDIA YATESI, new species 



PL LVIII, figs. 2a and 2b 



Description. — Shell averaging between 4 and 5 millimeters in 

 altitude, subcircular in outline, moderately convex. Beaks slightly 



