CLASS GASTROPODA 
169 
a dozen) strong, undulate or bearded cords with wider rather deep inter¬ 
spaces; axial sculpture of close, oblique, rather prominent incremental 
lines; aperture oblique, internally nacreous, the outer lip thin, the body 
with a glaze of nacre, the pillar lip concave, white, nacreous, with two 
rather formless nodulations anteriorly. Height, 8; maximum diameter, 
9 mm. (Dali.) 
Type in United States National Museum, No. 186070. Type locality, 
Tia Juana, Lower California. 
Range. San Diego, California, to Tia Juana, Lower California. 
Leptothyra grippi Dali, 1911 
Nautilus, 25: No. 3, 25. 
Shell small, solid, of about five whorls; the apex slightly flattened, 
nepionic whorls one and a half, small, nearly smooth, whitish; sculpture 
on the spire, on the second whorl three, increasing to five on the last whorl, 
strong, prominent, squarish spiral cords, articulated in the type with 
crimson and white, the interspaces at first smooth on the later whorls with 
one to three intercalary much smaller spiral threads; on the last whorl 
between the periphery cord and the next posterior cord five uniform fine 
threads, though this feature is probably variable; base flattened, trans¬ 
lucent white, with one articulated crimson and white color band around 
the umbilical region, which is also white; pillar broad, white, with one 
prominent knob of callus in the middle of it; throat brilliantly pearly; the 
whorl is laid slightly above the peripheral cord, which is covered by the 
advancing whorl; body color crimson; faint spiral striae on the flattened 
base; axial sculpture only of incremental lines. Height of shell, 5.25; of 
last whorl, 4.0; max. diam., 6.0 mm. (Dali.) 
Type in United States National Museum. Type locality, off entrance 
to San Diego Harbor, in 100 to 150 fathoms. 
Range. Known only from type locality. 
Family LIOTIIDAE 
Genus LIOTIA Gray, 1847 
Shell turbinated or depressed, varicose, perforated or umbilicated; 
whorls ribbed or cancellated; aperture rounded, pearly within; peristome 
thick, callously margined. (Tryon, Structural and Systematic Con- 
chology .) 
Type. Liotia scalaroides Reeve. 
Distribution. Tropical and subtropical. Fossil, Jurassic. 
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