24 LAND AND FRESH-WATER SHELLS OF N. A. [PABT 1> 



High table-lands of the interior of Lower California {Gahh). 

 The specimen figured is one of the original lot found by Mr. 

 Gabb. 



Subgenus HALOSPIRA, Mart. & Alb. 



Shell riraate, turreted or fusiform, apex conical, not truncated ; 

 whirls 11-14, the last not at all or but slightly protracted, cari- 

 nated at base ; columella plicate ; aperture quadrangular, peri- 

 stome free, expanded. 



Cylindrella roemeri, Pfr. — Shell scarcely rimate, subcylindrl- 

 cal, with au obtusely-conic non-truncated spire, substriate, light flesh- 

 colored ; whirls fourteen, narrow, ratlier flattened, the last 

 Fig. 18. cariuated at base, separated from the shell and twisted ; aper- 

 ture vertical, oblong, circular, within narrowed by a fold on 

 its right margin; peristome continuous, equally and briefly 

 expanded. Length 13-14, diam. 4^ mill. ; ap. 3 mill, long, 2} 

 broad. 



B. Smaller, more ventricose above ; whirls twelve, the last 

 more briefly loosened. Length 11, diam. above the middle 4 



tmill. 

 Cylindrella roemeri, Pfeiffer, Mon. Hel. Viv. II, 383 ; in 

 C. roemeri. Roemek's Texas, 456; in Cuemn. ed. 2, no. 81, pi. vii, 



f. 4-6.-W. G. BiNNEY, T. M. IV, 150. 



"New Braunfels, Texas. 



Cylindrella goldfussi, Mexke. — Shell umbilicated, elongated, 



more ventricose at the middle, apex conic, not truncated, thin, diaphanous, 



light horn-color, marked with numerous light, subarcuate 



Fig. 19. striae ; whirls twelve, scarcely convex, narrow, the last slightly 



. extended beyond the body of the shell, carinated, its right side 



^^ somewhat furrowed, rounded at base ; aperture subvertical, 



K] obliquely and subtriangularly pear-shaped ; peristome slightly 



'i^ expanded at its entire circumfereiice, its right termination 



flexuose. Axis with revolving lamella, and also with a 



^% curious one on the under side of the septum of the third 



whirl from the base. Length 11, diameter 44 mill. 

 C. gold/ussi. ° •* 



Cylindrella goldfussi, Menke, in Zeitsch. f. Mai. 1847, HI, 2. 



— Pfeiffer, Mon. Hel. Viv. II, 383. — Phillippi, Icon. Ill, C, tab. iii, 



9 (1847).— W. G. BiNNEY, T. M. IV, 151, pi. Ixxix, f. 33. 



Texas, on the Blanco. 



In the penultimate whirl of C. goldfussi there are four laraclloe: 



