UROCOPTIS, S. G. GONGYLOSTOMA. 187 



Cyl. scabrosa Gundl. mss., PFR., Malak. Bl., vi, p. 98 (no 

 description) ; ix, 1862, p. 131 ; Monogr., vi, p. 383. ARANGO, 

 Contrib., p. 123. Cyl. fibrosa GUNDLACH mss. in some col- 

 lections. 



Exceedingly peculiar in the fibrous sculpture. The surface 

 is more or less coated with calcareous earth, evidently held 

 by the slime of the snail. 



Section Sectilumen Pils. & Van., 1898. 



PILSBRY & VANATTA, Proc. A. N. S. Phila. 1898, pp. 271, 

 276. Type and sole species U. ornata. 



Urocoptis with two axial lamellae, the upper cord-like, the 

 lower acute and spinose, and in an intermediate whorl having 

 an accessory lamella on the upper partition, a smaller one on 

 the lower. Dentition as in Gongylostoma generally, the cen- 

 tral teeth being wide (pi. 61, fig. 16). (Sectus, cut; lumen, 

 window or opening.) Distribution eastern Cuba. 



The single species composing this Section has external 

 sculpture like Maceo or some forms of Idiostemma, and in- 

 habits the same region; but the axial lamellae and dentition 

 are such as occur in Gongylostoma. The accessory lamellae 

 special to the group are homoplastic with those of typical 

 Holospira. Nothing of the sort has been found in any other 

 Antillean species. The sculpture of the early whorls is un- 

 known. Like the preceding group, this does not seem closely 

 related to those following. The number of teeth in a row is 

 reduced to 8.1.8, as in the more specialized Gongylostomae. 



57. U. ORNATA ('Gundl.' Pfr.). PL 52, figs. 37, 38, 39, 40. 



Shell cylindrical, the upper 2 or 3 whorls only tapering, 

 solid, lustreless and opaque, light dull fleshy-brownish. Sur- 

 face very densely and minutely striate, the striae hair-like, 

 and having a series of white tubercles above and below the 

 sutures. Sometimes there are weak ribs unequally developed 

 on some whorls, and the latter half of the last whorl may be 

 ribbed. Whorls flattened, the suture impressed, the last 

 whorl ribbed beneath, not carinate, projecting free in a 

 rounded neck. Aperture oblique, oval, the lip thick, ex- 



