4-2 A MANUAL OF AMERICAN LAND SHELLS. 



side catting- points being absent; marginal teetli a simple modification 

 of the laterals, which pass very gradually into them, quadrate, wide, 

 jow, with one long, inner, obtuse cutting point and one outer side, 

 short, blunt cutting point. (See also Fig. 460.) 



Tliejawis arcuate, with slightly acuminated, blunt ends, thin; an 

 terior surface ribless; cutting edge simple; transversely and vertically 

 striated. 



Holospira Roeineri, Pfu. 



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

 riG.467. truncated spire, ^substriate, light flesh-colored; whorls 14 

 narrow, rather flattened, tlie lasj; carinated at base, separated 

 g from the shell and twisted ; aperture vertical, oblong, circular, 

 ^ within narrowed by a fold on its right margin ; peristome con- 

 %» tinuous, equally and briefly expanded. Length, 13-14'""^ ; di- 



ameter, 4^'"™. Aperture, 3""" long, 2^™"' broad. 

 W /5. Smaller, more ventricose above; whorls 12, the last 



H. Boemeri. ^^Qj.Q briefly looscucd. Length, ll'^"" ; diameter above the 

 middle, 4'"'". 



Cylhidrella /i-oemfn", Pfeiffer, Mon. Hel. Viv., ii, 383; iu Roemek's Texas, 4.^6; in 

 Chemn., e(L 2. No. 81, pi. vii, figs. 4-6.— W. G. Bixney, T. M., iv, 150 : L. & 

 Fr.-W. Sh., i,'24, fig. 18 (1869). 



BoloKpirn Uuemeri, Tryon, Am. Journ. Conch., iii,312 (1868).— W. G Binxey Terr 

 Moll., V, 177. ' 



New Biaunfels and Howard Springs, Tex. It has not been noticed 

 outside the Texan Subregion. 



Holospira Ooldfussi, Menke. 



Shell umbilicated, elongated, more ventricose at the middle, apes 

 Fig. 468. conic, nottruncated, thin, diaphanous, light horn-color, marked 

 ^ with numerous light, subarcuate stri;p; whorls 12, scarcely 

 P convex, narrow, the last slightly extended beyond the body 

 ^ of the shell, carinated, its right side somewhat furrowed, 

 rounded at base; aperture subveriical, obliciuely and sub- 

 i^ triangularly pear-shaped; peristome slightly expanded at its 

 H.ooidj-ussi. pjjtj^p 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, II"""; di- 

 ameter, 4^'""\ 



