HOLOSPIRA. 177 



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

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



The lingual membrane in //. Tryoni and P/eifferi, 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- 



. ' Fig 85 



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, 11 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, PL VII. Figs. 4-6. ^) 



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



,„,, . H Roemtri. 



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, Menkk. 



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

 apex conic, not truncated, thin, diaphanous, light horn-color, marked & 



with numerous light, subarcuate stria?; whorls 12, scarcely convex, Kj 

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

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

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

 peristome slightly expanded at its entire circumference, its right 

 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 J mill. 



Cylindrella Goldfussi, Menke, in Zeitsch. f. Mai. 1847, III. 2. — Pfeiffer, 

 Mon. Hel. Viv., II. 383. — Philliiti, Icon., III. '6, Tab. III. 9 (1847).— 

 VOL. IV. 12 



