54 COELOCENTRUM, SUBG. SPAETO CENTRUM. 



larly curved, columellar margin patulous, everted in the mid- 

 dle; columella twisted, slightly thickened. (Mdbille.) 



Plateaux above the arroyo de la Purissima, Lower Cali- 

 fornia. (Diguet.) 



Berendtia minorina J. MABILLE, Bull. Soc. Philomath, de 

 Paris (8), vii, 1895, p. 70. Cf. PILSBRY, Proc. A. N. S., Phila., 

 1900, p. 551. 



No dimensions are given, and the species has not been fig- 

 ured. The locality may be near the Mission de la Purissima, 

 above the twenty-sixth parallel in W. longitude 112 degrees. 



Var. GABBI Pilsbry. PL 13, figs. 17, 18, 19. 



Shell very slender and lengthened, cylindrical below, taper- 

 ing and attenuated above, retaining the apex perfect; thin, 

 rather fragile, covered with a light brown cuticle; composed 

 of 161/2-181/2 whorls, of which the initial one is globose, the 

 earlier 4% form a cylindric or apically swollen portion; in- 

 crease in the diameter of the shell beginning with the fifth 

 whorl and continuing for about 6 whorls, the remaining whorls 

 of about equal diameter; all whorls decidedly convex, sepa- 

 rated by well-impressed sutures, the last somewhat more 

 lengthened, a little flattened peripherally, its latter portion 

 becoming free (Cylindrella-likQ), the solute portion variable 

 in length, somewhat descending, decidedly carinated above, 

 obtusely angular at base, with a slight spiral groove within the 

 margin of the umbilical tract, the umbilicus pervious but 

 small. Sculpture : earliest 2% whorls with close, fine, straight 

 vertical riblets only, the next 2 whorls with the riblets cut into 

 beads by spiral strias; following whorls with strong arcuate 

 riblets separated by intervals of their own width, and about 62 

 in number on the next to the last whorl. Aperture irregularly 

 ovate, decidedly oblique, its length contained about five and 

 one-half times in that of the shell ; peristome thin, moderately 

 expanded throughout, the inner margin dilated and obtusely 

 angular in the middle ; columella slightly concave, a little exca- 

 vated below. Internal column rather slender, smooth oblique 

 and slightly gibbous below, less swollen within each whorl than 

 in C. irregulare. 



