122 AMERICAN JOURNAL 



smaller, with a much thicker columella. It is of much more 

 lively color, as also is P. elegantissima, Desh., which comes from 

 a widely distinct zoological province. 



TRIVIIDiE. 



Trivia californica, Gray. 



Habitat, Bodega Bay to Cape St. Lucas. 



Mr. Stearns kindly furnishes the following notes on the ani- 

 mals : 



" Shell nearly covered by the mantle, of which the superior 

 edges are closely spotted with white dots, and furnished on each 

 side with four tentacular filaments, with white tips. Soft parts 

 of an orange color; mantle mottled with brown, upper edge 

 crenulate or waved ; end of muzzle dark brown ; siphon long, 

 slit underneath. Tentacles long and slender." 



MARSENIIDiE. 



Lamellaria Stearnsii, n. s. 



Lamellaria depressa, Dall, MSS. 1866. 



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 polished. Lat. 

 •26, Ion. -2, alt. -12 in. 



Habitat, Monterey, California ; two specimens dead on beach ; 

 Dall, 1866. 



Lamellaria (? Stearnsii, var.) orbiculata. 



Shell resembling the last ; of two whorls and a half ; but 

 larger than L. Stearnsii ; whorls more inflated, aperture very 

 oblique, suture deeper, spire more elevated and proportionately 

 larger, columella rather thicker and more drawn out. Lat. 34, 

 Ion. -32, alt. -24 in. 



Habitat, with the last. Five specimens. 



Lamellaria rhombica, n. s. 



Shell pure white, subrhombical in shape, moderately elevated, 

 of three whorls. Columella thickened, stout, reflected, narrow, 

 with a groove behind the callus. Whorl appressed against, and 



