302 Umversity of California Publications in Zoology [ Vou. 14 
prominence; suture deeply impressed, distinct; aperture ovate; outer lip thick- 
ened and denticulated by ends of revolving internal ridges; inner lip incrusted, 
the incrustation spreading over part of body-whorl and columella; columella 
short, curved, spirally striated, and grooved deeply next to body-whorl; anterior 
sinus short, broad, recurved.’’ 
Height, 4 to 38 mm. 
Occurrence.—At stations D 5714 (1), D5739 (1), D5743 (1), 
D 5744* (1, 3), D 5747 (1), D5754 (3), D 5772 (22), D 5788 (18, 2), 
D 5792 (1), D5796 (1), D 5803 (4), D 5808 (7), D 5809 (8), D 5811 
(1), D 5821 (2), D5821 A (2), D 5828 (1), D 5824 B (1), D 5825 
(£.), D 5829 A (1), D 5833 (1), Fishing Grounds west of Golden Gate 
(6), Richmond (1), and questionably at D5710, D5724, D 5730, 
D 5763, D 5764, D 5785, D 5786, D 5790, D 5812. 
This’ mollusk was first reported from this region by Wood and 
Raymond (1891). It 1s common along the beaches of the open ocean, 
and has been taken by the Survey at a number of stations within the 
middle and lower divisions of the bay as well as outside the Golden 
Gate. Living specimens were dredged in 114 to 68 fathoms, bemg 
most frequently taken at a depth less than 10 fathoms. There ap- 
pears to be but little correlation between the distribution of this preda- 
ceous gastropod and the type of bottom upon which it was taken. 
Range—Strait of Juan de Fuca, Washington, to Cerros Island, 
Lower California (Dall). : 
Nassa mendica Gould 
Plate 35, figure 9; plate 58 
Nassa mendica Gould (1849b), p. 155; (1862), p. 70; Carpenter (1863), 
p. 662; Tryon (1882a), p. 56, pl. 17, figs. 370-232; Wood and Raymond 
(1891), p. 57; Arnold, R. (1903), p. 233. 
Description.—The following is Arnold’s (1903) description of this species: 
‘<Shell small, conical; spire elevated; apex acute; whorls seven, convex; 
ornamented with a varying number of transverse ridges and a few less promi- 
nent spiral ridges; suture deeply impressed, distinct; aperture subquadrate; 
outer lip thin, smooth on edge, but denticulated remote from margin; inner lip 
inerusted; columella curved, spirally striated, and separated from body-whorl 
by deep groove; canal short, recurved.’’ 
Height, 4 to 18 mm. 
Occurrence.—At stations D 5704 (6), D 5705 (4), D5706 (7, 4), 
D 5712 (1), D 5739 (4), D 5740 (8), D 5741 (1), D 5755 (1), D 5772 
(6), D5773 (14), D5775 (3), D5777 (1), D5779 (1), D 5781 (2), 
D 5791 (1, 1), D 5796 (2), D 5808 (1), D 5725 A (3), D 5827 B (1), 
D 5828 B (7, 1), D 5734 (1), and questionably at D 5701, D 5785, 
D 5797. 
