UROCCPTIS, S. G. GONGYLOSTOMA. 185 



b. Shell merely striate or rib-striate, corneous or 

 brownish, whorls less numerous, 10 to 25. 



Section Liocallonia, no. 71-83. 



4. Axis stout, with 3 nearly horizontal lamellae, sub- 

 equal in the intermediate whorls. 



Section Paracallonia, no. 67, 68. 



5. Axis with 1 to 3 lamellae, the upper one thickened 

 if wider than the lower, the latter spinose or ser- 

 rate, at least in the earlier whorls. 



a. Shell plain corneous or brownish, usually 

 somewhat translucent, striate or with spaced 

 riblets ; axial lamellae 1 to 3 ; the lower one 

 serrate, at least in the upper whorls ; aperture 

 pale within. Shell usually rather small. 



Section Gongylostoma, no. 84-114. 



b. Shell rather long, light colored, with a more 

 or less distinct basal brown band; last whorl 

 adnate or but shortly free ; axis straight above 

 the single, serrate, sub-basal lamella. 



Group of U. torquala, no. 115-125. 



c. Shell opaque, dull, purplish or brown, with 

 light riblets; aperture brownish inside; axis 

 with 1 to 3 lamellae, the lower projecting wid- 

 est. Group of U. trilamellata, no. 137-143. 



d. Shell variegated, corneous or brown and white. 



aa. Irregularly marbled, and with a series 

 of white subsutural beads; one or two 

 axial lamellae; basal keel indistinct. 



Group of U. coerulans, no. 126-136. 



bb. Irregularly marbled, nearly smooth, the 

 suture plain; axis stout, with a low cord 

 above the sub-basal lamella. Eastern 

 Cuba. Group of U. ventricosa, no. 145. 



cc. Brown with white-bordered dark stripes ; 

 basal keel distinct; axis with 2 subequal 

 lamellse. I. of Pines. 



Group of U. pruinosa, no. 144. 



dd. Corneous with sparse white stripes, or 



