282 University of California Publications in Zoology — (Vou. 14 
color, with paler spots; beaks purple; cardinal teeth two in the right valve, 
lamellar, remote; in the left valve four; rib broad, oblique.’’ 
Length, 15 to 65 mm. 
Occurrence—At stations D 5731 (3), D5732* (12), D 5735 (2) 
D 5736 (1), D 5737 (£.), D 5739 (4, 1), D 5741 (1), D 5778 (2), D 5796 
(3, 1), D 5807 (2), and questionably at D 5772, D 5808, and D 5809. 
This clam was reported by Wood and Raymond (1891) from San 
Francisco County. It has been taken by the Survey in all but the 
upper division of the bay. Living specimens are restricted to the 
middle divisions in depths ranging from 18 to 1934 fathoms. Known 
to occur along the shores of the open ocean. Since it burrows deeply 
the distribution pattern probably gives an imperfect idea of the actual 
distribution of this species. Judging from the data available, this 
clam prefers sandy bottoms. 
Range.—Lituya Bay, Alaska, to Monterey, California (Dall). 
MAcTRACEA 
MACTRIDAE 
Spisula Gray 
Spisula catilliformis Conrad 
Plate 27, figures 1 and 2; plate 24, figure 2 
Spissula catilliformis Conrad (1867), p. 193; Packard (1916), p. 285, pls. 
17, 18, and 19. 
Standella californica Conrad, Carpenter (1863), p. 640; Wood and Ray- 
mond (1891), p. 55. 
Description.—Conrad (1867) described this species as follows: 
“*Suboval, inequilateral; anterior side slightly flattened or contracted; pos- 
terior side with an oblique shallow groove or fold; lines of growth coarse and 
prominent, lunule very long, elliptical; ventral margin tumid posteriorly; 
cardinal pit oblique, large; pallial sinus extending beyond the middle of the 
valve.’’ 
Length, 90 to 100 mm. 
Occurrence.—At stations D 5808 (1), D 5829 A (1), D 5842 (9), 
D 5843 (5). 
This large clam has been reported from San Francisco by various 
collectors, often under the name of Standella californica. It is known 
to occur commonly along the beaches of the open ocean. In the col- 
lections of the Survey it is restricted to localities within the Golden 
Gate west of Fort Point. Shells were dredged at depths of 1014 to 
33 fathoms on gravelly bottoms. 
Range—Straits of Juan de Fuca, Washington, to San Diego, 
California. 
