THE NAUTILUS. 77 



small sub-equal compressed lamellae above, the upper one disappear- 

 ing or becoming a low cord at the middle, and the lower, denticulate 

 above, expands in the antepenultimate whorl into a somewhat 

 upward flaring broad plate, as in U.Jabreana: in the last two whorls 

 this lamella is reduced again, almost disappearing in the last one. 



Long. 29, diam. 6, apart, diam. 5.3. Whorls 13. 



Long. 23, diam. 5.6, apert. diam. 5. Whorls 10. 



Long. 25, diam. 6, apert. diam. 5.2. Whorls 10. 



Central Cuba ; Sierra de Canoa at Las Llanadas, District of 

 Mayajigua, Province of Santa Clara. 



This species belongs (o the Section Esochara Pils. and Van., and 

 is near U, fabreana, but differs in color, the close riblets, whorls 

 more convex, and chiefly by the upper lamella of the axis not being 

 obsolete above. Affinities with JJ. intermedia, etc., are evident. 



UrOCOPTIS (GoNGYLOSTOMA) DIMIDIATA, n. sp. 



Shell very similar externally to U. turgida, though differing in 

 color, the whitish flames being fewer and less undulated. Axis (as 

 in TJ. Strang ulata) " with two spiral lamellae above, the lower one 

 expanding in a broad, flat plate or spiral disk in the antepenultimate 

 and penultimate whorls, nearly reaching the outer wall of the cavity." 

 In the last whorl this lamella is reduced and the upper one effaced. 



Long. 28, diam. 9, ap. diam. maj. 7.2, ap. diam. min. 6.2, whorls 10. 



Long. 22, diam. 8, ap. diam. maj. 6.6, ap. diam. min. 6, whorls 8. 



Long. 25, diam. 8.8, ap. diam. maj. 7, ap. diam. min. 6, whorls 9. 



Central Cuba: Vereda de los Boqueles, over the mountain near 

 Aguada, district of Mayajigua, province of Santa Clara. 



The rejected portion of the spire (7 to 8 whorls) rapidly and con- 

 cavely tapering, striate, with the two and one-half embryonic whorls 

 smooth, corneous and slightly bulbous. Differs from JJ. strangulata 

 by its swollen shell, color pattern, less widely-spaced riblets, larger 

 and transversely ovate aperture, etc. From U. intuscoarctata differs 

 by these same characters and also by the more expanded disk of the 

 lower lamella, and the upper one effaced only in the last whorl. 



U. DIMIDIATA INTERMEDIA, n. var. 



Differs from typical TJ. dimidiata 'n more slender contour of shell. 

 Its color is corneous, with occasional inconspicuous brown streaks. 

 Aperture sub-circular. 



