UROCOPTIS, S. G. GONGYLOSTOMA. 279 



164. U. SCALARINA (Shuttleworth)). PI. 65, figs. 3, 4. 

 Shell fusiform-turrete, the lower half subcylindric, upper 



half strongly tapering, attenuate, the spire either entire or 

 more often narrowly truncate; thin, whitish or brownish 

 corneous. Surface without gloss, sculptured with strongly 

 elevated subvertical lamellae, which are hollow, and parted 

 by intervals of three or four times their width ; these intervals 

 smooth except for several spiral threads, which run up on 

 the anterior face of each lamella. Whorls very convex, sepa- 

 rated by a deeply constricting suture, the last whorl becoming 

 free, descending in a short neck. Aperture somewhat 

 oblique, sub-circular, the peristome expanded and flatly re- 

 flexed, white. Axis slender, with a very weak spiral trend. 



Length 10, diam. 2.2 mm.; whorls 17 (entire). 



Length 9, diam. 2.2 mm. ; whorls 10 (truncate) . 



Western Cuba: Yumuri Valley, near Mantanzas (Rugel) ; 

 Sitio Perdido, in Jaruco, Havana Province (Clerch). 



Cyl. scalarina SH., Bern. Mittheil, 1852, p. 297; Diagn. n. 

 Moll. no. 3, p. 37. PFR., Malak. BL, 1854, p. 212; Conchyl. 

 Cab., p. 50, pi. 5, f. 30-32; Monogr., iii, p. 479. ARANGO, 

 Contrib., p. 127. SOWERBY, C. Icon., xx, p. 9, f. 74. 



The ribs in this species are hollow, each being composed of 

 two laminae, as in Callonia, Idiostemma, etc. They are absent 

 from the first six or seven whorls. The shell is usually white 

 with the attenuate spire brown, but sometimes the brown tint 

 extends to the last whorl. The radula has 5.2.1.2.5 teeth, the 

 two inner laterals large, as usual in this group. The posterior 

 angles of the basal-plates are thickened (pi. 43, fig. 5, central 

 and first lateral in profile). 



165. U. BAHAMENSIS (Pfeiffer) . PL 65, figs. 19, 20. 



" Shell not rimate, slenderly fusiform, truncate, rather 

 thin, somewhat closely compressed-costate, corneous. Spire 

 noticeably tapering above, truncate, whorls remaining 9, 

 moderately convex, the last free, shortly drawn out, cylin- 

 dric. Aperture oblique, subcircular; peristome equally and 

 narrowly expanded throughout. Length 8.75, diam. 2.25, 

 diam. apert. 1.5 mm." (Pfr.) 



