1918] Packard: Molluscan Fauna from San Francisco Bay 317 
moderately constricted. Periphery of the last ~whorl very feebly angulated. 
Base short, inflated well rounded, with a very narrow umbilical chink. Aperture 
large; posterior angle acute; outer lip thin; inner lip strongly curved, some- 
what reflected and provided with a strong, oblique fold at its insertion; parietal 
wall glazed with a thin callus.’’ 
The type and three specimens, Cat. No. 214431, U. S. N. M., were collected 
at the U. S. Bureau of Fisheries Station D5729, in San Francisco Bay, on 
sticky, nearly black, mud in 4% fathoms. Cat. No. 214432, U. 8. N. M., con- 
tains four additional specimens also from San Francisco Bay, dredged at U.S. 
Bureau of Fisheries Station D5781, on coarse sand, pebbly and shell bottom, 
in 9%4,-16 fathoms.’’ 
Height, 3 to 4 mm. 
Occurrence.—At stations D 5729+ (7), D 5764 (4), D5781+ (4), 
D 5785 (1, 1), D5786 (2), D5785 (4), D5788 (1), D5810 (28), 
D 5836 (24), D 5839 (16), and questionably at D 5794, D 5836. 
As yet this new species is known only from the lower and middle 
divisions of the bay and from the open ocean in the vicinity of the 
Farallon Islands. Specimens were dredged in depths ranging from 
134 to 68 fathoms on bottoms varying from pure sand to pure mud. 
Range.—Known only from San Francisco, which is the type locality 
of the species. 
Odostomia farallonensis Dall and Bartsch 
Odostomia farallonensis Dall and Bartsch (1909), p. 221, pl. 27, fig. 7. 
Description.—This species was originally described as follows: 
“*Shell very elongate-ovate, deeply umbilicated, light yellow. Nuclear 
whorls very deeply immersed. Postnuclear whorls very slightly rounded in the 
middle between the sutures, more strongly so near the anterior end and toward 
the summit. Summit strongly narrowly tabulate. Periphery of the last whorl 
inflated. Base very strongly suddenly rounded, widely and deeply umbilicated. 
Entire surface marked by numerous fine, closely spaced, spiral striations. Aper- 
ture broadly ovate, posterior angle obtuse, outer lip thin; columella very 
slender, strongly curved, revolute, provided with a deep fold a little below 
its insertion; parietal wall glazed with a thin callus.’’ 
Occurrence.—This species was dredged by the ‘‘ Albatross’’ during 
a previous survey at station D 3180 off the Farallon Islands. 
Range.—Known only from the Farallon Islands which is the type 
locality for the species. - 
[Odostomia gravida Gould] 
Odostomia gravida Gould, Wood and Raymond (1891), p. 57; Dall and 
Bartsch (1909), p. 212, pl. 25, fig. 7. 
This species was reported from this region at a time before the 
specific distinctions now made were so well recognized. It is not 
