102 HOLOSPIRA. 



oblique streaks of fleshy-brown, several earlier whorls of the 

 same color. Whorls IQi/o to 211/4, hardly convex, the first 

 two smooth, following whorls of the cone densely and finely 

 striate, the cylindrical portion smooth except for indistinct, 

 subobsolete, coarser wrinkles; last whorl either smooth or 

 regularly ribbed, its latter half with crowded and rather 

 sharp striation ; it tapers downwards, and is well rounded 

 beneath, flat above, and considerably built forward. The 

 aperture is rounded-piriform, angular at the upper outer 

 part; peristome white, expanded and subreflexed, straight- 

 ened above. Interior ochre-brown; the column is also tinted, 

 small for a Coelostemma, and of about equal width throughout 

 the cylindrical portion, one-third the diameter of the shell. 

 Its surface is glossy and sculptured with slightly oblique, 

 subvertical riblets, with a few granules in places, formed by 

 their dislocation. 



Length 16, diam. 5.5 mm. ; whorls lO 1 /^. 



Length 17.2, diam. 5.4 mm. ; whorls 2iy 4 . 



Sierra Giiadalupe, Mexico, at 6,500 ft. elevation (Dr. E. W. 

 Nelson) . 



This species is chiefly remarkable for its long, cylindrical, 

 many-whorled shell, very blunt at the ends. While related 

 to //. dalli by its coloration and short apical cone, it differs 

 conspicuously in the slender internal column, as well as by 

 its pillar-like shape. The specimens occurred with H. dalli 

 and H. nelsoni. 



SPECIES OP UNKNOWN SYSTEMATIC POSITION. 



25. 11. .MICROSTOMA (Pfeift'er). PI. 15, figs. 4, 5. 



Shell subperforate, cylindrical, smooth, chalky; spire di- 

 lated above, passing into a short and rather acute cone ; suture 

 impressed. Whorls 18, rather flat, equal, the upper ones 

 plicatulate, the last striated, free in front, carinated above, 

 angular at the base, the angle disappearing anteriorly near 

 the mouth. Aperture small, vertical, subtriangular ; peri- 

 stome narrowly expanded throughout. Length lo^/o, diam. 

 5 mm. ; oblique length of aperture 2% mm. (P/V.) 



Habitat unknown- ( Turning coll.). 



