UROCOPTIS, S. G. GONGYLOSTOMA. 



the lower lamella small, more or less crenulate, becoming 

 very strong in the last whorl, and weakly continued below 



to the lip. 



Length 15, diam. 2.8 mm. ; whorls 14. 



Length 12.5, diain. 3.2 mm.; whorls 12. 



Length Iiy 2 -16, diam. 3 mm.; whorls 12-13 (P/r.). 



Western Cuba: Hato Sagua, at the foot of the Pan de 

 Guajaybon, Pinar del Rio, on rocks in shady forests (Gund- 

 lach) . 



Cyl. vincta Gundlach mss., PFR., Malak. BL, xi, 1863, p. 7, 

 no. 52; Novit. Conch., p. 434, pi. 97, f. 8-11; Monogr., vi, 

 p. 361. ARANGO, Contrib., p. 105. 



Near U. saxosa (Poey), but the lower lamella continues 

 to the lip, producing a notch at the base of the columella. 

 Figured from topotypes. 



Section Gongylostoma Albers, 1850. 



Gongylostoma ALB., Die Heliceen, p. 208, for C. sowerby- 

 ana, humboldtiana, rosea } variegata, elegans, crispula, 

 sagraiana and philippiana of Pfr., and porrecta Gld. 

 MARTENS, Die Hel., 1860, p. 38, C. elegans selected as type. 

 PILS. & VAN., Proc. A. N. S. Phila. 1898, pp. 269, 271, 276. 



Urocoptis with one or two spiral lamellae, the lower one 

 denticulate, at least in the upper whorls; sometimes a short 

 smaller lamella between the two. Shell unicolored, corneous 

 or brownish, or with paler riblets on a corneous ground. 

 Type U. elegans (Pfr.). 



The dentition (pi. 60, fig. 8, U. elegans auberiana) is sim- 

 ilar to that of most other West Cuban Cylindrellas, the 

 central teeth being wide, the laterals having large ectocones. 

 They decrease in size rather rapidly, nearly half the teeth 

 of each row being shortened and oblique; and they are less 

 crowded than in Liocallonia. Callonia has similar teeth, 

 but the number is reduced, and the cusps are narrower. 

 Whether these small differences between the teeth of the 

 sections of Gongylostoma will prove constant when more 

 species are examined remains to be seen. 



