HOLOSPIRA. 177 



Crosse for information regarding the jaw and dentition (Journ. de Conch., 

 XVIII. 13, 1870, PI. V., and Moll. Mex. et Guat., 320, PI. XVI.). 



The lingual membrane in H. Tryoni and Pfeifferi, examined and figured by 

 those authors, is of the same type. The centrals and laterals have a single 

 short cusp, bearing a short, blunt cutting point, both side cusps and side cutting 

 points being absent ; marginal teeth a simple modification of the laterals, which 

 pass very gradually into them, quadrate, wide, low, with one long, inner, obtuse 

 cutting point, and one outer, side, short, blunt cutting point. 



The jaw is arcuate, with slightly acuminated, blunt ends, thin, anterior sur- 

 face ribless ; cutting edge simple ; transversely and vertically striated. 



Holospira Roemeri, PFR. 



Shell scarcely rimate, subcylindrical, with an obtusely conic non-truncated 

 spire, substriate, light flesh-colored; whorls 14, narrow, rather flattened, the 

 last carinated 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, diameter 4^ mill. ; ap. 3 mill, long, 2| broad. 



/3. Smaller, more ventricose above; whorls 12, the last more 

 briefly loosened. Length, 1 1 mill. ; diameter above the middle, 4 mill. 



Cylindrella Roemeri, PFEIFFER, Mon. Hel. Viv., II. 383 ; in ROE- 



MER'S Texas, 456 ; in CHEMN., ed. 2, No. 81, PI. VII. Figs. 4-6. ^ 

 W. G. BINNEY, T. M., IV. 150; L. & Fr.-W. Sh., I. 24, Fig. 

 18 (1869). 



Holospira Roemeri, TRYON, Am. Journ. Conch., III. 312 (1868). 



New Braunfels and Howard Springs, Texas. It has not been noticed outside 

 the Texan Subregion. 



Holospira Goldfussi, MENKE. 



Shell umbilicated, elongated, more ventricose at the middle, Fig. 86. 

 apex conic, not truncated, thin, diaphanous, light born-color, marked 

 with numerous light, subarcuate striae; whorls 12, scarcely convex, 

 narrow, the last slightly extended beyond the body of the shell, 

 carinated, its right side somewhat furrowed, rounded at base ; 

 aperture subvertical, obliquely and subtriangularly pear-shaped ; ^^ 

 peristome slightly expanded at its entire circumference, its right 



...... H. Goldfusti. 



termination flexuose. Axis with revolving lamella, and also with a 



curious one on the under side of the septum of the third whorl from the base. 



Length, 11 mill.; diameter, 4 mill. 



Cylindrella Goldfussi, MENKE, in Zeitsch. f. Mai. 1847, III. 2. PFF.IFFER, 

 Mon. Hel. Viv., II. 383. PHILLIPPI, Icon., III. 6, Tab. III. 9 (1847).- 

 VOL. IV. 12 



