A NEW VOLUTOID SHELL FROM MONTEREY BAY. 



BY J. J. RIVERS. 

 SCAPHELLA (VoLUTA) ArNHEIMI. 



Shell regularly formed, elongate-ovate; bod}^ whorl 

 more than two -thirds as long as the spire; the spire an 

 inch long, and made up of six whorls, the terminal nu- 

 cleus being very small, pointed and oblique, which latter 

 character places this species in the section Scaphclla of 

 Dall. 



Ground color obscure yellow, covered by a layer of 

 chalk-like deposit. The body whorl has some coarse 

 longitudinal elevations and depressions, remnants of for- 

 mer lip extensions, and there are two large patches of dark 

 rusty red at a wide interval which do not appear to form 

 an interrupted band. The aperture is elegantly formed 

 and measures iJ/q inches long by ^ inch wide; the inner 

 lip is regularly outlined on the columella; columella plaits 

 four, sharply oblique, the last one strongest, forming a 

 prominent ridge parallel to the canal. The upper out- 

 lines of the mouth meet in a sharp angle, but the base has 

 a well defined bifurcation. The whole of the aperture 

 and the edge of the outer lip are heavily coated with en- 

 amel of a yellowish tint, and rust stained. Size 3^3 

 inches long and iy% wide. Animal without operculum. 



Dredged in Monterey Bay, California. 



2d Ser., Vol. HI. July 14. 1891. 



