UROCOPTIS, S. G. GONGYLOSTOMA. 251 



Length 10.4, diam. 3.5 mm. ; whorls 



Western Cuba: Lagunillas, in dist. of San Juan y Mar- 

 tinez, prov. Pinar del Rio (Wright). 



Probably the specimens referred by Pfeiffer to U. discors 

 in Malak. BL, xi, p. 127, belong to this variety, which differs 

 from discors chiefly in the more inflated form and in the 

 development of an upper axial lamella. 



131. U. DIAPHANA 'Wtf'ght' Pils., n. sp. PL 57, fig. 48. 



Shell similar externally to U. discors, but the axis bears 

 two small subequal lamellae above, the upper one reduced in 

 the intermediate whorls, where a third small cord is inter- 

 posed. 



Length 15.5, diam. 3 mm. ; whorls 12. 



Length 12.2, diam. 2.7 mm.; whorls 10%. 



Western Cuba (Wright). 



? Cyl. diaphana Wright, ARANGO, Contrib., p. 117. 



Arango gives a confused description of the pillar, and 

 refers to Pfeiffer, who never described the species, but men- 

 tions it among the undescribed (Monogr., viii, 449). Crosse 

 merely quotes Arango 's reference. The above description 

 is from shells received as Cyl. diaphana from Charles Wright. 

 Probably it intergrades with discors, the axial structure 

 being quite variable in Gongylostoma. 



132. U. AFFINIS (Pfeiffer). PL 57, fig. 41. 



Shell cylindrie, the upper third or half tapering to a wide 

 or sometimes rather narrow truncation; brownish-corneous 

 profusely streaked with white, or whitish with corneous 

 flames; thin. Surface somewhat glossy, finely striate 

 throughout, the striation coarser on the last whorl, changing 

 to narrow, sharp riblets on the neck. Suture crenulated by 

 small, regular, white beads. Wliorls slightly convex, the last 

 free, the neck short or moderately long, slightly descending. 

 Aperture subvertical, rounded, brown inside, the well ex- 

 panded lip white. Axis encircled by a compressed lamella 

 in the lower whorls, serrate in the median and upper whorls, 



