1918] Packard: Molluscan Fauna from San Francisco Bay 309 
‘“Tnterior pure white, the two dark rays sometimes showing through the 
shell. Extreme outer edge finely denticulate or rounded and smooth, according 
to the stage of growth. Margin as a whole broad, smooth, differentiated from 
the rest of the surface by a wide, shallow groove. Margin of the aperture 
similarly bordered. Muscular impressions distinct, surface marked by fine 
radiating lines; polished. Anterior and posterior margins internally concave 
or emarginated, so that when laid upon a flat surface in the natural position 
the ends of the shell do not touch it.’’ 
According to Cooper (1888, p. 235), this species occurs at the 
Farallon Islands. It has not been found among the Survey collections. 
Range.—Bolinas Bay to Santa Barbara, California (Dall). 
TURBINIDAB 
Astralium Link 
Astralium triumphans (Philippi) 
Plate 34, figures 4a and 4b 
Trochus triumphans Philippi (1841), p. 8; Pilsbry (1888), p. 228, pl. 58, 
figs. 67, 68. 
Description.—Pilsbry (1888) described this Japanese species as follows: 
“‘Shell low-conic, imperforate, metallic brownish-purple above, nearly white 
below; whorls 6, slightly convex above; body whorl armed around the carinate 
periphery with long slender closed tubular radiating spines, about eight in 
number on the body-whorl, and which are reabsorbed as the growth advances 
leaving only short stumps to festoon the sutures; upper surface with close 
revolving series—generally eight to ten on the last whorl—of minute laterally 
compressed granules; base slightly convex, usually with a marginal row of 
granules, and several rows surrounding the central callus; aperture transversely 
ovate, angulate and channelled at peripheral carina, iridescent within; peristome 
sinuous above, umbilical region covered with a heavy callus; more or less stained 
with pinkish, somewhat excavated at center and spirally ridged.’’ 
Height, 10 mm. 
Occurrence.—Near station D 5807* (7). 
This Japanese species was dredged alive just outside the Golden 
Gate. It has not heretofore been reported from North America. 
Although the locality lies within the course of oceanic traffic, the 
probabilities are against the dredging of a single specimen that may 
have been carried across the Pacific and then dropped from the bottom 
of a ship. If this form is exotic, it presumably has established itself 
in these waters. 
Range.—Japan. Known on the Pacifie Coast only from San Fran- 
cisco. 
