198 UROCOPTIS, S. G. GONGYLOSTOMA. 



crenata, pi. 48, figs. 7, 8* 12. (Para, beside; Callonia, the 

 following group.) 



The axis in this group is intermediate between that of 

 Pycnoptychia, in which the lower lamella is widest, and Cal- 

 lonia, in which the upper one dominates in the median whorls. 

 There are two species, U. albocrenata, with a variegated shell, 

 bead-strung below the suture, in external features closely 

 imitating some forms of the group of U. coerulans, and U. 

 triplicata, plain with the suture simple. Both are from 

 western Cuba. 



67. U. ALBOCRENATA ('Giindl.' Pfr.). PI. 48, figs. 7, 8, 12. 

 Shell cylindric or swollen in the middle, the upper fourth 



tapering to a wide truncation, rather thin, marbled white and 

 translucent-corneous. Surface rather glossy, sculptured 

 with oblique low rib-striae, and with a conspicuous row of 

 white nodules below the suture. Whorls slightly convex, the 

 last very shortly free or rarely adnate, rounded below, with 

 a very low basal cord. Aperture subcircular, the white peri- 

 stome expanded and reflexed. Axis very slender above, some- 

 what swollen below the middle, encircled with three subequal 

 lamellae, the lower one slightly predominating in the penult, 

 and next earlier whorls, denticulate, the upper lamella equal- 

 ing it in the next two whorls upward. 



Length 14, diam. 3.3 mm. ; whorls 11%. 



Length 13, diam. 3.5 mm.; whorls 11-12 (Pfr.). 



Length 11.2, diam. 3.1 mm. ; whorls 10%. 



Western Cuba: Catalina de Guane, Pinar del Rio (Wright). 



Cyl. albocrenata Gundl. mss., PFR., Malak. BL, xi, 1863, p. 

 7, no. 51; Monogr., vi, p. 373. ARANGO, Contrib., p. 116. 

 SOWB., C. Icon., xx, pi. 4, f. 27. 



Somewhat like U. perlata of eastern Cuba, but albocrenata 

 differs by the strong striation and marbled coloration, and 

 has a wholly different type of axial sculpture. It varies from 

 a strictly cylindric shape to moderately swollen. 



68. U. TRIPLICATA (Arango). 



Shell subrimate, cylindric-turreted, rather solid, remotely 



