286 University of California Publications in Zoology — [Vou. 14 
Carpenter (1863) mentions that this species was sold in the 
markets in San Francisco. It is known to occur as a borer in the rocks 
along the ocean beach, both north and south of the Golden Gate. 
Range—Bolinas Bay to Todos Santos Bay, Lower California 
(Oreutt). 
SAXICAVIDAE 
Saxicava Fleuriau 
Saxicava arctica (Linnaeus) 
Plate 30, figure 4 
Mya arctica Linneaus (1767), p. 1113. 
Saxicava arctica, Carpenter (1863), p. 637; Wood and Raymond (1891), 
p. 50. 
Description.—Professor Clark translates the original description as follows: 
‘*Shell the size of a bean, rough, similar in appearance to Arca noae, pale, 
anterior end very obtuse, posterior end shorter, somewhat pointed; anterior 
part projects beyond the lines of growth as two distinct angles, somewhat 
pointed anteriorly. Milky colored internally; with scarcely any hinge.’’ 
Length, 3 to 25 mm. 
Occurrence—At stations D 5762 (1), D5773 (2), D5845 (2), 
D 5846 (7, 2). 
Living specimens were dredged near Sausalito and within the 
Golden Gate west of Fort Point. In several instances this species was 
found as a nestler in pholadid borings. 
Range—Aretie Ocean to Panama (Dall). 
Saxicava pholadis (Linneaus) 
Plate 30, figure 5 
Saxicava pholadis (Linnaeus), Carpenter (1863), p. 637; Keep (1911), p. 
101. 
Description.—This species is characterized by Keep (1911) as follows: 
‘«Shell small, thin, wrinkled and irregular. The beaks are near the front 
of the shell which is abruptly terminated. Ligament small, extending behind 
the beaks. Color ash white.’’ 
Length, 25 mm. 
Occurrence.—At Sausalito (7). 
This species is represented in the Survey collections by a single 
specimen that was obtained from the beach at low tide line. 
Range.—Cireumpolar ; Bering Sea to Panama (Dall). 
