494 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxm. 



The type and another specimen (Cat. No. 163009, U.S.N.M.) were 

 collected by Mr. H. Hemphill at San Diego, California. The type has 

 eight post-nuclear whorls, and measures: Length 3.3 mm., diameter 

 1.1 mm. 



Two other lots belonging to the University of California have been 

 examined — one, a single specimen, comes from Station 30 off Catalina 

 Island. The other three specimens were obtained at Station 47, San 

 Diego, California. 



TURBONILLA (TURBONILLA) GILLI DELMONTENSIS, new subspecies. 



Plate XLIV, fig. 7. 



Shell, similar to T. gilll^ but much more stout and less turreted, with 

 the ribs less strongly developed and the peripheral thickening only 

 weakly represented. The tj^pe has lost the nuclear whorls, the eight 

 remaining measure: Length 3.4 ram., diameter 1.2 mm. 



Type.—OdX. No. 195921, U.S.N.M. It was collected by Mr. S. S. 

 Berry in 12 fathoms off Del Monte, Monterey, California. 



Subgenus CHEMNITZIA D'Orbigny. 



Chemnitzia D'Orbigny, Hist. Nat. lies Canaries, 1839, p. 77; =Euturbonilla 

 Semper (part), Archiv. Nat. Fr. Meek., 1861, pp. 354-361; =Microbeliscus 

 Sandberger, 1874. 



Turbonillas without spiral sculpture, having prominent axial ribs 

 which fuse or terminate at the periphery. The intercostal spaces are 

 deep and sunken and terminate at or a little above the periphery, 

 extending upward to the summits of the whorls. Base smooth, devoid 

 of all sculpture. Columella straight. All our West American species 

 belonging to this group are small, slender, forms of semitranslucent 

 bluish-white to milk-white color. 



Ti/pe. — Melania campanellse Philippi. 



KEY TO SPECIES OF CHEMNITZIA. 



Shell large, length 10 mm. or more montereyensis. 



Shell small, length 5 mm. or less muricatoides. 



TURBONILLA (CHEMNITZIA?) MONTEREYENSIS, new name. 



= Turbondla gracillima Gabb, Proc. Cala. Acad. Sci., 1865, p. 186; not Chemnitzia 

 gracillima Carpenter, Cat. Maz. Shells, 1856, p. 431. 



Mr. Gabb's description is as follows: 



Shell small, very slender, long, white; vertex broken; whorls eleven or more, flat- 

 tened on the sides; sutures strongly impressed, ribs about 23, large, obtuse, running 

 from the suture to the margin of the base, base convexly truncated, smooth, aperture 

 subcircular; cokimella thick. Length 10 mm., diameter 3.3 mm. 



Habitat, Monterey, California; Dr. J. G. Cooper collector. This shell can be readily 

 distinguished by its extremely slender form and the strong, slightly oblique ribs. 



