410 PROCEEDINOS OF THE NATIONAL MUSEUM. vol.39. 



KEY TO THE GENUS ALABINA. 



Shell without sculpture turrita. 



Shell sculptured. 



Shell without axial sculpture (except lines of growth). 



Shell with a single spiral cord between the sutures occidentalis. 



Shell with five low, spiral cords between the sutures barbarensis. 



Shell with axial sculpture. 

 Axial ribs strong. 



Spiral sculpture consisting of broad cords. 



Shell large; adult more than 6 mm. long hamlini. 



Shell small; adult less than 4 mm. long phanea. 



Spiral sculpture not consisting of broad cords. 

 Spiral sculpture consisting of slender cords. 



Shell slender, conic diomedese. 



Shell stout, broadly conic ignati. 



Spiral sculpture consisting of incised lines californica. 



Axial ribs slender or obsolete. 



Axial ribe broad, but feebly developed. 



Spiral sculpture absent io. 



Spiral sculpture present t. phalacra. 



Axial ribs slender. 



Adult shell less than 5.5 mm. long monicensis. 



Adult shell more than 7 mm. long. 



Spiral sculpture obsolete between the sutures tenuisculpta. 



Spiral sculpture strong between the sutures t. diegensis. 



ALABINA TURRITA Carpenter. 



Plate 62, fig. 4. 

 Styliferina turrita Carpenter, Proc. Cal. Acad. Nat. Sci., vol. 3, 1866, p. 219. 



Shell small, elongate-conic, white. Nuclear whorls minute, appar- 

 ently not differentiated from the remaining turns. Post-nuclear 

 whorls strongly flattened, somewhat overhanging, separated by a 

 deeply channeled suture, apparently without sculptm-e. Periphery 

 and base of the last whorl well rounded. Aperture ovate, posterior 

 angle acute, outer lip thin; columella short, moderately strong, shghtly 

 reflected. 



Doctor Carpenter's type (Cat. no. 15566, U.S.N.M.), which has fur- 

 nished this description and figure, has 8 whorls and measures: Length 

 1.7 mm., diameter 0.6 mm. It was collected by Doctor Cooper at San 

 Pedro, California. 



ALABINA OCCIDENTALIS Hemphill. 



Plate 62, fig. 2. 



Eulimella occidentalis Hemphill, Zoe, vol. 4, 1894, p. 395. 



SheU elongate-conic, subdiaphanous. Nuclear whorls 1^, small, 

 well rounded, smooth. Post-nuclear whorls with a very strong, con- 

 cavely sloping shoulder, which extends from the appressed siunmit 

 over the posterior third of the whorls terminating there in a well 



