COLUMNA. 



189 



Fig. 328. 



Cylindrella taylori, Pfeiffer. — Shell not rimate, eylindrically 

 subulate, integral, thin, paper-like, with stout, coarse, longitudinal wrinkles, 

 becoming gradually delicate towards the apex, which is 

 smooth, color dead white ; spire much attenuated, apex 

 obtuse ; suture impressed; whirls nine, the upper ones 

 rather convex, the two lower ones flattened, the last ob- 

 tusely carinated below, slightly twisted, and produced 

 beyond the body of the shell, in front rapidly descending, 

 acutely carinated, disjoined, produced ; aperture semicircu- 

 lar, very oblique ; peristome continuously free, acute, thin," 

 the columellar portion effuse. Length 45, diameter 8 ; aper- 

 ture 10 long, 8^ mill wide. 



Clausilia (Balea) taylori, Pfeiffer, Proc. Zool. Soc. 18G1, 



27, pi. ii, f. 7. 

 Cylindrella newcomhiana, Gabb, Am. Journ. Conch. Ill, 



237, pi. xvi, f. 3 (1867). 

 Eucalodium newcojnbianum, Bland, Ann. N. Y. Lye. IX. 



Central range of mountains. Lower California. 



The shell figured was received from Dr. Newcomb. Its generic 

 position is somewhat doubtful. 



Jaw arcuate, witli a slight median pro- 

 jection, longitudinally costate, the costte 

 9-13, flattened, their terminations scarcely 

 produced at the anterior or cutting mar- 

 gin, parallel with which are a few fine 

 striae. 



Lingual membrane with 126 rows of 

 32 — 1 — 32 teeth, centrals with one long 

 median cusp, and two short, blunt side- 

 cusps, laterals the same, without the inner side-cusp. 



Fig. 329. 



Jaw and teeth of 

 Cylindrella nerocombiana. 



COI.U]WI¥A, Perry. 



Shell sinistral or dextral, subulately turreted, decussately 

 granulated ; apex obtuse, whirls constricted at the suture, the 

 lower impressed in the middle ; aperture elongated, auriform, 

 narrowed posteriorly ; columella callous, loosely spirally twisted, 

 forming an open canal along the length of the spire, the base 

 abruptly truncate ; peristome simple, straight, acute. 



