CLASS GASTROPODA 
47 
Shell smooth, excepting microscopic incremental lines. (Carpenter.) 
Type. Caecum laeve C. B. Adams. 
Distribution. Europe, United States, West Indies, Mazatlan, Aus¬ 
tralia, Japan, Mauritius. Fossil, Eocene, .... 
Fartulum orcutti Dali, 1885 
Proceedings of the United States National Museum, 8:541. 
Shell small, smooth, but not polished; light warm brown in color and 
without sculpture, except very slight lines of growth. Shell slightly curved, 
the anterior aperture very oblique, about at right angles to the plane of the 
diameter of the plug, the superior margin being the anterior; plug glandi¬ 
form, smooth, rounded, without mucro; operculum brown, thin, smooth. 
Length of shell, 2.0; diameter, 0.75 mm. (Dali.) 
Type in United States National Museum, No. 20927. Type locality, 
San Diego, California. 
Range. San Pedro to Mazatlan, Mexico. 
Fartulum occidentale Bartsch, 1920 
Type in United States National Museum, No. 152166. Type locality, 
San Pedro, California. 
Range. San Pedro to Lower California. 
Fartulum hemphilli Bartsch, 1920 
Type in United States National Museum, No. 340728. Type locality, 
San Pedro, California. 
Range. San Pedro, California, to Lower California. 
Fartulum bakeri Bartsch, 1920 
Type in United States National Museum, No. 340729. Type locality, 
San Pedro, California. 
Range. San Pedro, California, to Lower California. 
Genus ELEPHANTULUM Carpenter, 1858 
Surface of shell marked by raised ridges, which coincide with the long 
axis of the shell; annulations strongly developed; operculum thin, cor¬ 
neous, concave. (Bartsch.) 
Type. Caecum hexagonum Carpenter. 
Distribution. California and south. 
