54 STERKIA. 



This species is distinct from 8. eyriesi and 8. rhoadsi by 

 the more strongly developed teeth, particularly the longer, 

 stouter palatal folds. 



In a specimen from Mandeville there is a well developed 

 interpalatal fold near the inner end of the upper palatal. 

 The lower palatal is unusually long and the size small: 

 length 1.53 mm. (figs. 10, 11). Whether these are individual 

 or racial peculiarities cannot be determined without more 

 material. This specimen was reported as Bifidaria rhoadsi 

 in Proc. A. N. S. Phila., 1910, p. 521. 



4. STERKIA CLEMENTINA (Sterki). PL 7, figs. 9, 10, 13. 



"Shell very minute, narrowly perforate, cylindrical, pale 

 horn-colored, transparent, with rather obtuse apex; whorls 

 5y 2 , regularly increasing, moderately rounded, with rather 

 deep suture, smooth, with few microscopic striae, somewhat 

 shining; last whorl occupying rather more than two-fifths of 

 altitude, somewhat ascending to the aperture, with a slight, 

 revolving impression on the middle of its last third, ending 

 at. the auricle; a very slight, flat, crest-elevation near the 

 margin, only in the lower part. Aperture lateral, scarcely 

 oblique, subovate with the palatal margin slightly flattened, 

 upper part of same somewhat sinuous, peristome a little ex- 

 panded with a slightly thickened lip just at the margin; 

 lamellae 6, white: two on the apertural [parietal] wall, the 

 apertural [parietal lamella] typical, and a rather long supra- 

 apertural [angular] ending in a callus at the upper termina- 

 tion of the palatal margin ; columellar one typical, horizontal ; 

 basal very small, nodule-like, deep seated; palatals two, 

 typical, the inferior a little longer. 



''Alt. 1.9, diam. 0.8 mm.; apert, : alt. 0.6, diam. 0.5 mm. 

 (Sterki). 



11 Alt. 1.8, diam. 0.9 mm.; 5 whorls. Paratype." 



San Clemente Island, California, type loc. ; also Santa Bar- 

 bara Island (H. Hemphill). 



Pupa Clementina STERKI, Nautilus, iv, August, 1890, p. 44, 

 pi. 1, f. 4. Bifidaria Clementina oldroycice VANATTA, Nau- 

 tilus, xxx, August 1916, p. 48. 



