20070 
VW 
Volume 21. Number 3. March, 1919. Whole Number 167. 
THE WEST AMERICAN SCIENTIST 
A Popular Review and Record for the Pacific Coast. 
The oldest scientific magazine west of the Mississippi. 
SUBSCRIPTION PRICE: $3.00 per volume (of about 200 pages). 
Current or back numbers 25 cents each (as far as available; 
number 1 has been reprinted, and other out-of-print num- 
bers will be reprinted as the demand may justify). 
ADVERTISING RATES: 25 cents per line, in this style of type only. 
—____9——_____ 
Charles Russel! Orcutt 
Editor: Publisher: Owner 
No. 1705 Broadway San Diego, California. 
21:0131 Corbula porcella Dall. Off Baja Cal. 
shell small, ashy white, inequivalve, the left valve smaller; 
inequilateral, the posterior end larger; rounded in front, pointed 
behind; a prominent angle separates the posterior dorsal area 
Irom the rest of the disk; surface concentrically evenly threaded, 
the threads little pronounced on the dorsal area; an obscure al- 
most microscopic radial striation is sometimes apparent; the 
siphons protrude beyond the rostrum with a dense covering of 
wrinkled periostracum; interior white, himge normal, the basal 
margin of the right valve partly overlapping that of the left 
valve; pallial sinus obsolete; length 8.5, height 4, diameter 4.5 
mm., but the shell is often larger. Extends from the Santa Bar- 
bara Islands, Cal., to Panama. 
21:0132 Cerbula kelseyi Dall. Catalina I., Cal. 
Shell rather large, rounded triangular, whitish, heavy, not 
inflated; the surface sculptured by low concentric lamellae, a 
little more prominent near the posterior end of shell, separated 
by equal or slightly wider interspaces crossed by fine radial 
threads which do not crenulate the lamellae; there is no defined 
posterior dorsal area or keel; interior with a deep anteriorly 
rounded pallial sinus, fused with the pallial line below for the 
greater part of its length. There seems to be a small narrow 
lunular area in the left valve. Length 16, height 10, diameter 
of left valve 3 mm. Named in honor of Prof. F. W. Kelsey, of 
San Diego, Cal. Esteros bay to Catalina Island, Cal. 
21:0133 Panomya arctica turgida Dall. Alaska. 
21:0134 Panomya beringiana Dall. Bering Sea. 
21:0135 Saxicavella pacifica Dall. Off Pt. Loma, Cal. 
Shell small, thin, white, with a pale olive dehiscent periost- 
