XXXIV KEY TO UROCOPTIMS. 



d 2 . Axis nodose, or encircled with a spiral cre- 

 nate cord or ribbed double cord. 



Subg. Idiostemma, xv, p. 164. 



d s . Axis with a strong spiral lamella. Esocliara, 



xv, p. 188, has rather narrow central teeth; 



and Arangia, xv, p. 162, may also prove to 



belong here. 



c 1 . Central tooth wider, its cusp approaching in 

 size the ectocones of the lateral teeth. 

 d. Axis without lamella or spines. 



e. Shell stout; an accessory lamina in base 



of last whorl, which is carinate below. 



Haiti. Subg. Autocoptis, xv, p. 147. 



e 1 . Shell thin, small, subcylindric ; base not 



distinctly carinate. Western Cuba. 



Subg. Cochlodinella, xv, p. 175. 

 e 2 . Shell very slender, fusiform or subcylin- 

 dric, with round neck and small round 

 aperture ; axis weakly one- or two-plicate. 

 Sect. Tetrentodon, xv, p. 267. 

 d 1 . Axis with one or more spiral lamellae, the 

 lower one crenate or spinose, at least in the 

 upper whorls. 



Subg. Gongylostoma, xv, p. 182. 

 & 1 . Two lateral teeth on each side very large, the 

 marginal teeth usually 4 to 7 in number, very 

 much smaller than the laterals, vestigial, and of 

 conspicuously different shape; radula extremely 

 long and narrow. 



c. Ectocones of one or both lateral teeth reduced, 



more or less vestigial; marginals in nearly 



straight transverse rows (vol. xvi, pi. 9, 10). 



Shell with the peristome entire or nearly so. 



Brachypodella, xvi, p. 40. 



c 1 . Ectocones of the lateral teeth moderately de- 

 veloped; marginals in oblique rows (xvi, pi. 1, 

 fig. 13). Shell with thin peristome, widely in- 

 terrupted above (pi. 1, figs. 1-12). 



Pineria, xvi, p. 108. 



