MARINE UNIVALVES 185 
Nassa méndica, Gld., the Lean Nassa, 
Figure 187, is a variable species hav- 
ing a more slender shell than the last. 
The surface is marked with numerous 
fine, spiral lines, crossed by ridgy vari- 
ees. Color, light brown, with a white 
peristome. It occurs all along the coast, from Pu- 
get Sound to San Diego. Var. cooperi, Fbs., has a 
few strong transverse ribs and small spiral lines. 
Nassa californiana, Conr., the California Nassa, 
is a rare species, sometimes found alive on the 
coast of the southern half of California, particu- 
larly about San Pedro. It is as large as N. fos- 
sata, and has the seulpturing and general form of 
N. perpinguis. It is found fossil in various local- 
ities in the State. 
Fig. 187 
