OP CONCHOLOGT. 313 



2. Holospira Goldfussi, Menke. 



Plate 15, figure 31. 



Elongate, swelled in the middle ; apex conic, not truncated ; 

 thin, translucent, lightly striate; whorls twelve, flat, narrow, the 

 last carinated at base ; aperture obliquely sub-triangular, lip 

 slightly expanded, continuous. Light horn color. 



Length 11, diam. 4-4: mill. 



Texas. 



3. Holospira Remondi, Gabb. 



Plate 15, figure 32. 



Oblong-elliptical, subtruncated, whorls twelve, the first two 

 and a half smooth, the rest densely obliquely striate, the last 

 whorl convex at the base, aperture round, with reflected lip ; 

 umbilicus minute. White. 



Length 11, diam. 3 mill. 



Sonora, Mexico. 



4. Holospira Pfeifferi, Menke. 



Plate 15, figure 34. 



Oblong-ovate, thin, pellucid, densely obliquely striate ; spire 

 oblong, conical, apex obtuse ; whorls twelve, convex, subcom- 

 pressed at the base ; aperture rounded, peristome shortly reflect- 

 ed. White. 



Length 17-5, diam. 5-6 mill. 



Sonora, Mexico. 

 Larger, with fewer and larger stride than H. Remondi ; the 

 the whorls also are more rounded. 



6. Holospira irregularis, Gabb. 



Plate 15, figure 30. 



Cylindrical, slender, whorls sixteen to eighteen, slightly con- 

 vex, the last one subangulated below; suture slightly impressed ; 

 minutely umbilicate ; aperture small, subquadrate, lip slightly 

 expanded ; surface with small longitudinal ribs. Color light 

 brown. 



Length 25, diam. 5 mill. 



Lower California. 



