CLASS GASTROPODA 
235 
Yellowish to purplish, thin, smooth, narrow, extremities rather bluntly 
produced, lip thinly margined, with a callous margin on the columella. 
(Tryon, Manual of Conchology.) 
Type in Lamarck Cabinet. Type locality, West Indies? 
Range. San Pedro to San Diego, California, Acapulco, Mexico, At¬ 
lantic. 
Simnia variabilis C. B. Adams, 1850 
Catalogue of Shells Collected at Panama, 31. Tryon, Manual of Conchology, 7: 
PI. 5, fig. 44. 
Shell very slender; usually white, with a slight tinge of rufus, with the 
lip opaque white; sometimes of a rich red purple; smooth; aperture not 
very narrow, a little widened anteriorly, moderately produced, effuse, and 
slightly inflected posteriorly; obliquely emarginate anteriorly; lip well 
thickened; columella with a longitudinal keel, acute and obliquely produced 
anteriorly, posteriorly somewhat biplicate. Length, .54; breadth, .15 in. 
(C. B. Adams.) 
Type in Amherst Museum. Type locality, San Juan, Lower California. 
Range. Monterey, California, to Panama. 
Subgenus Neosimnia Fischer, 1884 
Simnia catalinensis Berry, 1916 
Nautilus 30:21; PI. 5, fig. 3. 
Shell very thin, fusiform, swollen above the middle; maximum diame¬ 
ter contained about 2 y 2 times in the length; color a nearly pure porcelain 
or pearly white, the extreme ends tinted with brownish yellow for a dis¬ 
tance of 2 to 3 mm. Surface polished and glossy; closely and finely longi¬ 
tudinally striate, the striae readily visible to the eye and rather irregular, a 
few being somewhat coarser than the remainder. Spiral sculpture com¬ 
prising some 20-25 low cords at each end, becoming minutely wavy as they 
are intersected by the longitudinal striae; indications of an extremely faint 
wavy spiral striation over the rest of the shell are discovered by a strong 
lens. Shell pointed at both ends, but distinctly more produced at the apex 
than at the base. Outer lip not greatly thickened, bordered by a narrow 
white callus; retracted at both ends, in each instance with an obscure angle. 
Columella sinuous; a low spiral fold and channel at the summit obliquely 
encircling the axis. Length, 23 ; maximum diameter, 8J4 mm. (Berry.) 
Type in Berry Collection, No. 1224. Type locality, off Avalon, Catalina 
Island, California, in 50 fathoms. 
Range. Monterey, California, to Gulf of California. 
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