1918] Packard: Molluscan Fauna from San Francisco Bay 265 
Occurrence.—A single valve was obtained from station D 5788*, 
outside the Golden Gate, in 68 fathoms on a bottom composed of pure 
sand. 
Range.—Bering Strait to San Diego (Dall). 
LEPTONACEA 
LEPTONIDAE 
Kellia Turton 
Kellia laperousi (Deshayes) 
Plate 19, figure 4 
Chironia laperousi Deshayes (1839), p. 357; Carpenter (1863), p. 643; 
Wood and Raymond (1891), p. 55; Dall (1900a), p. 1155; Arnold, R. 
(1903), p. 137, pl. 18, figs. 7, 7a. 
Description—The following is Arnold’s (1903) description of this species: 
‘*Shell of medium size, suborbicular, convex, thin; umbones slightly 
anterior, not prominent; surface sculptured by fine incremental lines which 
are slightly variable as to prominence; no lunule; each valve with one very 
prominent cardinal tooth; right valve with two posterior laterals, left with 
one; hinge-area lacking between cardinal and lateral teeth; muscle-impressions 
not distinct.’’ 
Length, 7 to 25 mm. 
Occurrence.—At station D 5846 (3, 26). 
This bivalve was dredged by the Survey only from the western 
‘portion of the Golden Gate.. Living specimens were there found 
nestling in pholadid borings at a depth of 45 fathoms. However, it 
is not so restricted, for Mr. A. L. Barrows reports this species in 
similar situations at low-tide mark on Goat Island. 
Range.—Bering Sea to San Diego, California (Dall). 
Rochefortia Velain 
Rochefortia ferruginosa Dall 
Rochefortia ferruginosa Dall (1916b), p. 411. 
Description.—Dall described this species as follows: 
“Shell small, white, thin, subdonaciform, compressed, invariably coated 
with a ferruginous layer like some species of Axinulus, inequilateral; anterior 
side longer, apical angle about 90; both ends rounded, base arcuate. Length, 
4.5; height, .325; diameter, 1.5 mm.’’ 
San Francisco Bay is the type locality for this species. It was 
not taken by the Survey. 
Range—Known only from San Francisco Bay, which is the type 
locality for the species. 
