162 UROCOPTIS, S. G. ARANGIA. 



ened, resting upon the preceding whorl. Length 15-16, diam. 

 4-5 mm.; apert. with perist. 4 mm. (Weinl.). 



Haiti: Jeremie (Weinland). 



Cyl. innata WEINL., Malak. Bl., xxiii, 1876, p. 170, pi. 2, 

 f. 1, 2. PFB., Monogr., viii, p. 621. 



"In general appearance it is nearly related to C. tumidula 

 W. & M., but differs by the adnate last whorl and peristome, 

 besides the opacity of the more solid, lustreless shell, and the 

 much stronger, less numerous, white, irregular ribs, which 

 recall the large C. arcuata." 



Subgenus ARANGIA Pilsbry & Vanatta, 1898. 



P. & V., Proc. A. N. S. Phila. 1898, pp. 270, 275. Type 

 U. sowerbyana (Pfr.). 



Urocoptis with a single strong, smooth spiral lamella re- 

 volving about the axis, median in each whorl, sometimes 

 obscurely double in some lower whorls. Last whorl carinate 

 below, shortly or not free in front. (Named for Rafael 

 Arango y Molina.) 



Eastern Cuba and Gonave Island, Haiti. This group of 

 but two species is probably related to Idiostemma, but the 

 dentition is still unknown. U. monticola, the Haitian species, 

 may prove, when the dentition is examined, to belong near 

 Amphicosmia. The shape of the base is unusual in Urocoptis. 



37. U. SOWERBYANA (Pfeiffer). PL 44, figs. 22, 23, 24. 



Shell cylindric-tapering, narrowly truncate, rather solid, 

 pale brown, usually with some inconspicuous whitish streaks. 

 Surface lustreless, sculptured with fine, nearly straight or 

 subarcuate riblets, narrower than their intervals, and often 

 a little stronger near the sutures. Whorls 15-16, narrow, 

 convex, the last very shortly or not free in front, carinate at 

 the periphery, which forms nearly a right angle, the base 

 being flattened, only slightly convex. Aperture transversely 

 oval or subcircular; peristome thin, expanded throughout, 

 usually free, but sometimes shortly adnate above. Axis bear- 

 Ing a very strong median ascending lamella, acute above, 

 round-edged below, and subobsolete in the last whorl. 



