166 PALEONTOLOGY OF CALIFORNIA. 



? A. CARINIFERA, n. S. 

 PI. 28, Fig. 46. 



I propose this name for a minute shell, of which I have but a 

 single rather imperfect cast. It is short, robust fusiform, the 

 whorls rounded, the body whorl tapering gradually in advance, 

 instead of ending in a slender canal, as in the typical Anchuras. 

 The lower whorls carry a single prominent rib on the middle, 

 and the margin of the mouth is broken where (if it is an Anchura) 

 the lip process should take its rise ; the whole surface is orna- 

 mented by numerous revolving striae, visible both on the shell 

 and, to a less degree, on the cast, becoming strongly marked on 

 the inner margin of the outer lip. 



Length of the fragment, less two or three volutions of the apex, .32 inch. 



From the Martinez Group, Martinez. 



I have referred this little shell to the genus Anchura, with considerable hesita- 

 tion, because I have no proof that it possessed the expanded lip, and because the 

 anterior canal, which in all the known species is slender, and more or less produced, 

 is, in this case, short and robust. Further specimens will be necessary before its 

 true generic relations can be definitely settled. 



HELICAULAX, Gabb. 



II. BICARINATA, n. S. 

 PI. 27, Fig. 47. 



Shell robust fusiform, spire elevated ; whorls six ; sides regu- 

 larly sloping, body whorl bicarinate, the upper edge of the whorl 

 joining the upper carina of the preceding volution, so as to pro- 

 duce a continuous slope to the apex. Surface marked by numer- 

 ous, minute revolving lines, one or two of which, below the lower 

 angle of the body whorl, are larger than the others ; a series of 

 small nodes on each carina of the last whorl. Aperture broad, 

 continued posteriorly by a long, slender canal running up the 

 spire to near the apex, and then curving outwards and backwards; 



