TIIK NAUTILUS. 43 



row truncation ; rather thin ; streaked with white on a pale brown 

 ground. Surface silky, closely subarcuate-striate ; suture simple. 

 Whorls 8-9 scarcely convex, the last shortly free in front with a 

 cord-like keel around the base. Aperture slightly oblique, subcir- 

 cular, slightly narrowed laterally, light brown within ; columellar 

 fold visible deep within ; peristome nearly white, expanded and re- 

 flexed throughout, but narrow in the peripheral region. Axis en- 

 circled by two subequal compressed lamellae, the lower denticulate in 

 the upper whorls, and both rapidly enlarged in the antepenult and 

 penultimate whorls, smaller in last whorl. 



Long. 22, diam. 6.2, apert. 5 mm. Whorls 9. 



Long. 19, dinua. 6, apert. 4.8 mm. Whorls 8. 



Long. 20, diam. 6, apert. 5. Whorls 8.5. 



Central Cuba ; El Purio, near Calabazar de Sagua and El Capiro, 

 near Santa Clara, Province of Santa Clara. A locality also called 

 " Las Villas." 



This species obviously belongs to the Subgenus Gongylostoma. It 

 approaches U. obliqua but differs by its larger size, simple suture and 

 by the wider lamella? of the axis, etc. 



UROCOPTIS (GONGYLOSTOMA) PROTEUS, n. sp. 



Shell rimate, cylindric, somewhat swollen, the upper tlrrd taper- 

 ing to a rather narrow truncation ; thin ; brown, marbled with white 

 flames ; surface obliquely rib-striate ; suture sub-crenulate. Whorls 

 9-11, a little convex, the last purplish, shortly free in front, with an 

 obsolete basal keel. Aperture slightly oblique, subcircular, brown 

 within ; peristome, columella and upper wall white ; peristome ex- 

 panded and reflexed. Axis encircled by three compressed lamellae, 

 the lowest denticulate above the middle, moderately expanded in the 

 three last whorls, the others disappearing in the penultimate whorl. 



Long. 22, diam. 6, aperture 4.2 mm. Whorls 11. 



Long. 17, diam. 5.2, aperture 3.2 mm. Whorls 9- 



Long. 20, diam. 6, aperture 4 mm. Whorls 10. 



Central Cuba, Sierra de Bamburanao near Seibabo de Yaguajay 

 in the Province of Santa Clara. 



Similar to U. villarensis but its whorls are more convex with rib- 

 lets separated by wide intervals, suture subcrenulate and the axis en- 

 circled by three instead of two compressed lamellae. 



