N0.1574. WEST AMERICAN PYRAMIDELLTD.I^DALL AND BARTSCH. 495 



The type, according to Mr. Gabb, is in the collection of the Cali- 

 fornia Geological Survey," but appears to have been misplaced or lost. 

 From the description we are led to believe that it is a form similar to 

 T. to/'fjuata, but of considerably broader spire. 



TURBONILLA (CHEMNITZIA) MURICATOIDES, new species. 

 Plate XLIV, figs. 2, 2a. 



Shell small, slender, subdiaphanous to milk white; nuclear whorls 

 2i, helicoid but slightly elevated, well rounded, having their axis at 

 right angles to the axis of the post-nuclear turn. Post-nuclear whorls 

 smooth, rather high between the sutures, moderately rounded, marked 

 by strong sublamellar axial ribs, which are about half as wide as the 

 spaces that separate them, and extend strongly to the very summit of 

 the whorl where they render the well-marked sutures crenulate. There 

 are l-i of these ribs upon the first, 18 upon the tifth, and 20 upon the 

 penultimate turn. The depressed intercostal spaces terminate abruptly 

 at the^periphery. Base of the last whorl well rounded, smooth, with- 

 out sculpture. Aperture: (outer lip fractured), columella slender, 

 slightly twisted. 



The type has seven post-nuclear turns and measures: Length 3.0 mm. , 

 diameter 1.0 mm. It is Cat. No. 195942, U.S.N.M., and comes from 

 Monterey, California. Another specimen. Cat. No. 160488, U.S.N.M., 

 was collected b}^ Doctor Dall at the same place. 



Subgenus STRIOTURBONILLA Sacco. 

 Striolurboidlla Sacco, I Moll, del Piemonte e della Liguria, 1892, p. 94. 



Shell as in TurhoniUa and Chemn'itzla but tinel}^ and closeh^ sj^irally 

 striated on the spire and base. 



Type. — S. alpina Sacco. 



All our West American species, with the exception of T. cfffinls and 

 T. smithsoni^ are of bluish-white to milk-white color; the two excep- 

 tions being of a yellowish cast. 



KEY TO SPECIES OF STRIOTURBONILLA. 



Whorls overhanging, shell stout Vancouver ensis. 



Whorls not overhanging, shell slender 



Whorls strongly rounded, ribs sinuous stylma. 



Whorls almost flattened, ribs straight seme. 



TURBONILLA (STRIOTURBONILLA) VANCOUVERENSIS Baird. 



Plate XLIV, fig. 1. 

 Chemnitziavancouverensis Baird, Proc. Zool. Soc, 1863, p. 67. 



Shell solid, rather broad and stout, subdiaphanous, bluish to milk- 

 white. Nuclear whorls two, large, helicoid, partly obliquely immersed 

 in the first of the later turns. Post-nuclear whorls well rounded, with 



a Proc. Cal. Acad. Sci., 1865, p. 183. 



