CLASS GASTROPODA 
227 
is a few faint incremental lines; base rounded, convex, imperforate, with a 
minute umbilical dimple, behind which is a small callus; aperture ovate, 
simple, the outer lip arcuate, simple, hardly produced except near the 
suture, with a retractive wave near the periphery; pillar thick with a small 
callus behind it; height, 1.2; larger diameter, 1.8 mm. (Dali.) 
Type in United States National Museum, No. 225190. Type locality, 
off South Coronado Island, near San Diego, California. 
Range. Known only from type locality. 
Teinostoma bibbiana Dali, 1919 
Proceedings of the United States National Museum , 56:369. 
Shell minute, very similar to T. sapiella, but smaller, more depressed 
relatively, and more transparent and thin; aperture circular, with a thinner 
callus on the body, and only a small linguiform pad behind the pillar lip. 
Height, 0.75; longer diameter, 2 mm. (Dali.) 
Type in United States National Museum, No. 274123. Type locality, 
San Diego, California. 
Range. Known only from type locality. 
Teinostoma sapiella Dali, 1919 
Proceedings of the United States National Museum, 56:369. 
Shell minute, white, translucent, solid, of about two whorls, including 
a minute dark brown subglobular nucleus; suture distinct; surface glossy, 
smooth; last whorl only moderately enlarged and little produced at the 
aperture; base rounded, depressed in the center, with a pad of enamel 
leaving a slight chink but no perforation in the umbilical region; aperture 
subcircular, the outer lip thin, a thick callus on the body and a large 
ovate pad behind the pillar lip; height, 1; longer diameter, 2 mm. (Dali.) 
Type in United States National Museum, No. 127560. Type locality, 
San Pedro, California. 
Range. San Pedro to San Diego, California. 
Teinostoma invallata Carpenter, 1864 
Supplementary k Report, British Association for the Advancement of Science, 652. 
Proceedings of the California Academy of Sciences, 3:215. 
Without keel. (Carpenter.) 
E. t. E. supravallatac, aliter exacte simili; sed vallo spirali omnino 
carente; basi angulata, haud carinata. (Carpenter.) 
[ 829 ] 
