Conchological Memoranda, No. VI. 



May 18, 1871. 



Preliminary Descriptions of New Species from the West Coast 

 OF America. 



By R. K. C. Stkarns. 



Monoceros paucilirata : Stearns. 



Shell moderately elevated, whorls 4-6; body whorl four-fifths the total length, 

 angulated above and excavated between the angle and the suture ; a sharp groove 

 behind the tooth. Upper whorls cancellated, nucleus smooth. Aperture elongate, 

 purple brown in the throat; outer lip sharp, yellowish, internally denticulated, 

 with a prominent tooth at its outer edge. Columella pur{)le, canal short, umbili- '' 



cus nearly covered by the columellar callus. Siphonal fascicle strong. Exter- 

 nally painted with longitudinal broad black and narrow whitish streaks, inter- 

 rupted by the white dental groove and three or four narrow yellowish revolving 

 carinse, which, except the keel, are inconspicuously elevated. Lon. .55 ; Lat. 

 .33 in. Habitat — Ooronado Islands, off Saa Diego, California. Hemphill, three 

 specimens. 



Ocinebra circumtexta : Stearns. 



Shell ovate, solid, sub-turreted, of five convex whorls. Upper whorls cancel- 

 lated ; body whorl traversed by about 14 roughly-rounded revolving cost.T. 

 more or less tuberculated at the intersection of the longitudinal ribs, and marked 

 with fine incremental strijB. Last whorl three-fourths the length of the shell ; 

 outer lip thickened internally denticulate, external edge crenulated. Columella 

 excavated, light purple or purplish brown ; canal short, open or closed in speci- 

 mens of equal size. Umbilicus obsolete ; surface of whorls with faint irregular ^^ ^ ' / 

 longitudinal costse. Color dingy white, with two interrupted black or dark 

 brown bands. Lon. .85; Lat. .5 in. Habitat — Monterey, California; Hemphill, 

 Harford, Gordon, and Stearns, sixteen specimens, mostly immature. 



Ocinebra gracillivia : Stearns. 



Shell small, solid, fusiform, slender ; spire subacute; whorls 6-7 ; body whorl 

 about two-thirds the whole length. Upper part of whorls subangulate, aperture 

 about as long as the spire. Outer lip thickened internally ; white, with four promi- 

 nent denticles. Columellar lip excavated, callous, with a purplish stain showing 

 through the enamel. Canal moderate, closed. Surface smooth, with numerous 

 fine whitish revolving costa;, dotted with brown, the interspaces near the outer lip 

 with brown linear markings. Upper whorls longitudinally nodosely ribbed. Gen- 

 eral color olivaceous, with patches of yellow. Lon. .5 ; Lat. .25 in. Habitat — 

 San Diego, California, 10 fms.; Hemphill. 



The above are merely preliminary to detailed descriptions hereafter to be pub- 

 lished in the American Journal of Conchology. 



