324 Unwersity of California Publications in Zoology [Vou.14 
bay to the upper portion of San Pablo Bay. It was frequently found 
associated with Ostrea lurida. 
Range.—Puget Sound to Panama. 
Crucibulum Schumacher 
Crucibulum spinosum (Sowerby) 
Calyptraea spinosa Sowerby (1820-1824), pl. 23, figs. 4, 7. 
Crucibulum spinoswm Carpenter (1863), p. 654; Tryon (18866), p. 118; 
Arnold (1903), p. 306. 
Description.—Arnold (1903) described this species as follows: 
‘«Shell conical, elevated, apex rather acute, slightly curved, smooth, sub- 
central; surface ornamented with numerous rounded, radiating ridges, and 
sometimes with concentric rows of spires; concentric lines of growth visible; 
a cup-shaped lamina is attached along a line on one side of the interior of the 
shell; inner surface smooth; rim thin; aperture nearly circular.’’ 
Carpenter mentions this species as occurring on the Farallon 
Islands. No specimens were obtained by the Survey. 
Range.—Farralon Islands to San Diego (Carpenter). 
NATICIDAE 
Polinices Montfort 
Polinices draconis (Dall) 
Plate 38, figures 2a and 2b 
Lunatia draconis Dall (19036), p. 174. 
Description.—Dall originally described this species as follows: 
“Shell depressed, solid, cream color, sometimes with a ferruginous or livid 
tinge, with six whorls; nuclear whorl very small, smooth; later ones with an 
obseure, nearly obsolete spiral sculpture like flattened-out threads, over which 
run microscopic, close-set, spiral striae: suture with the whorl in front of it 
feebly channeled and the excavation bounded by an obsolete thread; top of the 
whorls flattened, part of the base bordering the umbilicus also flattish, the 
remainder of the whorl rounded, turgid; umbilicus wide and deep, its walls 
excavated and closely spirally striated aperture oblique, semi-lunate, outer lip 
thin, base rounded; the angle where the lip meets the body filled with a smooth 
white callus, the anterior angle of the pillar lip also thickened.’’ 
Height, 13 to 60 mm. 
Occurrence.—At stations D 5787 (f.), D 5788 (2), D 5789 (7, 1), 
D 5790 (1), D 5848 (1), Fishing ground west of Golden Gate (15), 
and questionably at D 5718, D 5763 D 5811, D 5842. 
Dall (1903d) reports this species from the Farallon Islands from 
a depth of 37 fathoms. Determinable specimens of this form were 
obtained by the Survey only from the open ocean. It was dredged at 
depths ranging from 3 to 68 fathoms on bottoms comprised of fine 
