252 UROCOPTIS, S. G. GONGYLOSTOMA. 



a second, upper lamella about equal to the lower, appearing 

 in the whorls above the middle. 



Length 15, diam. 3.2 mm. ; whorls lO 1 /^. 



Length 12.5, diam. 3.2 mm. ; whorls 9. 



Length 12, diam. 3 mm.; whorls 10 (Pfr., type). 



Western Cuba: Hacienda Sumidero, district of Pinar del 

 Rio ; also Teneria, dist. of Guane, both in prov. Pinar del Rio 

 (Wright). 



Cyl affinis PFR., Malak. Bl., xi, 1864, p. 127 ; Monogr., vi, 

 p. 375. ARANGO, Contrib., p. 118. 



Similar in general appearance to U. discors, but much more 

 finely striate. 



133. U. HEYNEMANNI (Pfeiffer). PI. 58, figs. 67, 68. 



Shell rather deeply rimate, cylindric-turrete, rather solid, 

 closely arcuate-striate, variegated corneous and whitish; 

 spire somewhat swollen in the middle, the apex rather broadly 

 truncate; suture rather closely white-crenate. Whorls 11, 

 a little convex, the last shortly free, obsoletely thread-cari- 

 nate. Aperture a little oblique, subcircular; peristome free, 

 a little reflexed throughout. Internal column encircled by 

 two compressed, subequal, parallel lamellae. Length 12^2 

 to 13, diam. 3% mm. (Pfr.). 



Western Cuba: La Teneria, in the district of Guane, prov. 

 Pinar del Rio (Wright). 



Cyl. heynemanni PFR., Malak. Bl., xii, 1865, p. 120; 

 Monogr., vi, p. 374. ARANGO, Contrib., p. 117. 



" Related to C. discors, affinis and albocrenata, but besides 

 the external characters of the shell, it departs widely from 

 all of them in the structure of the internal pillar." 



Much more slender and smaller than U. obliqua, whieh has 

 similar axial structure; the riblets and subsutural tubercles 

 more distinctly raised, white on a pale corneous ground, the 

 specimens before me not otherwise variegated. 



Length 12, diam. 3.2 mm. ; whorls 10. 



Length 12, diam. 3.6 mm. ; whorls 11, 1% above the plug. 



U. discors and related species differ by the weaker develop- 



