340 University of California Publications in Zoology (Vou. 14 
OLIVIDAE 
Olivella Swainson 
Olivella biplicata Sowerby 
Plate 37, figures 5a and 5b 
Olivella biplicata Sowerby (1825), p. 33; Tryon (1883a), p. 87, pl. 34, fig. 
58; Wood and Raymond (1891), p. 57; Arnold, R. (1903), p. 219. 
Description.—The following is Arnold’s (1903) description of this species: 
“*Shell small, subeylindrical; spire only slightly elevated; apex subacute; 
whorls five or six, flat, smooth, except for very fine incremental lines; suture 
appressed, very distinct; body-whorl convex, but nearly flat near outer lip; 
aperture elongate-triangular; outer lip thin, nearly straight; inner lip thickly 
incrusted, the incrustation forming quite a ridge; columella completely incrusted 
around lower portion, two prominent plications.’’ 
Height, 10 to 25 mm. 
Occurrence.—At stations D 5755 (1), D5765 (1), D5776* (2), 
D 5809 (5), and questionably at D 5777. 
This large olive shell was first reported from this region by Wood 
and Raymond (1891). It is restricted in the Survey collections to 
four stations within the middle division of the bay. It was dredged 
in depths ranging from 134 to 314 fathoms from bottoms comprised 
of sand and stones. 
Range.—Strait of San Juan de Fuca, Washington, to San Diego, 
California (Cooper). 
Olivella intorta Carpenter 
Plate 37, figure 7 
Olivella intorta Carpenter (1856b), p. 207; Arnold, R. (1903), p. 220. 
Description.—This species was described by Arnold (1903) as follows: 
“Shell small, subovate; spire elevated, solid; whorls five, flat, smooth; 
suture appressed, very distinct; body-whorl ventricose, smooth; aperture long, 
narrow, widening anteriorly; outer lip thin; inner lip incrusted, incrustation 
thick, forming callus on body of middle whorl near aperture; columella with 
smooth incrustation over lower portion, and one prominent, sharp plait on lower 
side.”? 
Height, 5 to 16 mm. 
Occurrence.—At stations D 5731 (37), D 5732 (6), D 5733 (5, 1), 
D 5734 (6), D 5735 (23; 1), Dis737 (45, 1), D'5788 (7), D 5790 GF 
D 5708 (7), and questionably at D 5738. 
This southern species has not hitherto been reported as far north 
as San Francisco. It is restricted in the Survey collections to localities 
outside the Golden Gate, with the exception of one station west of 
Fort Point. Living specimens were dredged at depths of 734 to 68 
