CLASS GASTROPODA 
135 
Megalomphalus californicus Dali, 1903 
Plate 97, fig. 7 
Proceedings of the Biological Society of Washington, 16:175. Bulletin 112, United 
States National Museum, PI. 14, fig. 7. 
Shell small, elevated, with a wide umbilicus and whitish color; whorls 
two and a half, the last much the largest, rounded above with a prominent 
suture, below with a wide funicular umbilicus bordered externally by an 
obtuse carina; surface sculptured axially with numerous coarse oblique 
threads separated by narrower interspaces and crossed by fine partially 
obsolete spiral striation; aperture semilunate, entire, very oblique; the 
pillar lip straight, but the whole peristome simple and thin. Height, 5.5; 
of aperture, 3.5; max. diameter, 5.5 mm. (Dali.) 
Type in United States National Museum, No. 109307. Type locality, 
Santa Barbara Islands, California. 
Range. Known only from the type locality. 
Described as Macromphalina californica Dali. 
Family LAMELLARIIDAE 
Genus LAMELLARIA Montagu, 1815 
Shell internal, ear-shaped, thin pellucid; spire lateral, very small; aper¬ 
ture large, patulous, both lips regularly arcuated; axis imperforate. No 
operculum. (Tryon, Manual of Conchology.) 
Type. Lamellaria perspicua Montagu. 
Distribution. Norway, Britain, Mediterranean, New Zealand, 
Philippines, west coast of North America. Fossil, Pliocene. 
Lamellaria stearnsii Dali, 1871 
Plate 92, fig. 6 
American Journal of Conchology, 7:122; PI. 15, fig. 6. 
Shell pure white, suborbicular, depressed, of three whorls. Columella 
sharp, thin, widely arcuated; loosely twisted so that the apex is discernible 
from below. Spire hardly elevated above the last whorl; suture distinct, 
sharply defined; aperture very effuse, rounded. Exterior marked by lines 
of growth, crossed by microscopic fine revolving striulae. Interior pol¬ 
ished. Lat., 26; long., 2; alt., 12 in. (Dali.) 
Type in United States National Museum. Type locality, Monterey, 
California. 
Range. Puget Sound to San Diego, California. 
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