74 HOLOSPIRA. 



the median whorls are more flesh-colored, or have a violet 

 shade. The white and opaque embryonic whorls are smooth, 

 then fine, sharp riblets appear, which gradually pass into 

 coarse, closely-placed and very obtuse riblets, which are re- 

 lieved against the background by their intensely white or at 

 least lighter color, and stand alone or are coalescent. Upon 

 the last whorl these riblets become again sharper, that is, more 

 raised. The whorls, though flatly convex, project a little at 

 the suture, so that it is impressed. The last whorl is some- 

 what compressed around the very narrow umbilical chink, 

 laterally flattened near the aperture, not free for very long, 

 and provided with a wide, calloused sutural keel above, which 

 corresponds to" a wide channel in the aperture. The end of 

 the columellar lamella is visible more or less distinctly upon 

 the inconspicuous somewhat oblique, deep-seated columellar 

 fold. The columellar lamella revolves around the internal 

 column in the last whorl, increases rapidly and then decreases, 

 and at its largest projects rather far in the lumen of the 

 whorl. The parietal lamella does not hang vertically, but its 

 lower edge flares outwards somewhat; it increases slowly in 

 size and then diminishes rapidly. The basal lamella is very 

 short, callous, and strongest at the end. The palatal fold is 

 still shorter and weakly developed, and is not visible through 

 the shell from the outside. The interior is here ochre-yellow, 

 while the inside of the mouth is white. 



Length 13.8, diam. 4.5, alt. apert. 3.3, width 3.5 mm. ; whorls 



Length 14.8, diam. 4.6, alt. apert. 3.5, width 3.4 mm. ; whorls 



Mexico (Liebmann). 



Cylindrella pilocerei PFR., Monogr., ii, p. 382; iii, 579; iv, 

 710 ; vi, 389 ; Conchyl. Cab., p. 61, pi. 6, f . 32, 33. PHILIPPI, 

 Abbild. u. Beschreib., iii, p. 5, pi. 3, f. 7, 8. Holospira pilo- 

 cerei Pfr., FISCHER & CROSSE, Miss. Scient. Mex., Moll., i, p. 

 329, pi. 17, f. 5. STREBEL, Beitrag, iv, p. 82, pi. 5, f. 1. 

 CROSSE, Journ. de Conchyl., xl, 1892, p. 265, pi. 5, f. 3, 3 a, 

 and var. B, p. 266, pi. 5, f/4, 4 a. MARTENS, Biologia, p. 278. 

 In all cases exclusive of references to Pfeiffer's Symbolae and 

 Philippics Abbild., i. Not C. pilocerei Pfr., 1841. 



