THE NAUTILUS. 49 



Gannina River, three miles S.-W, of San Dieguito, State of San 

 Luis Potosi. A single specimen taken. 



Smaller than P. pterostoma with the last whorl free, the aperture 

 sinused at both ends, and the lip hardly expanded. 



DESCRIPTIONS OF TWO NEW CUBAN LAND SHELLS. 



BY DR. CARLOS DE LA TORRE, HAVANA, CUBA. 



Macroceramus hendersoni n. sp. PI. 4, fig. 5. 



The shell is perforate, conic-turrited, thin, the last 5 whorls 

 corneous-brown, profusely and finely mottled with opaque white, 

 with a series of irregular, lengthened brown spots at the periphery, 

 showing above the suture on the spire ; first 2^ whorls blackish- 

 brown, the next two dark, broadly maculate with white. Surface 

 glossy, the first 4 whorls smooth, the rest closely and finely striate, 

 the strisB low, as wide as their intervals, and very oblique. The 

 spire is straightly conic, apex rather acute. Whorls 11, slightly 

 convex, separated by a smooth suture, the last whorl well rounded 

 peripherally and beneath. Aperture very oblique, ovate, marked 

 with brown inside. Peristome expanded and reflexed, yellow or 

 pale red. Columella brown, short, dilated, and having a rather 

 strong but short fold above. Parietal callus transparent. The in- 

 ternal axis is slender and distinctly twisted spirally. 



Length 19, diam. 9.5, length of aperture 8 mm. 



Length 20, diam. 9.8, length of aperture 8 mm. 



Length 18, diam. 9.5, length of aperture 8 mm. 



Sierra de Cubitas, Camaguey, Cuba. 



This species is very distinct from all others now known, differing 

 from the canimarensis group by the total absence of a basal carina, 

 and from the forms prevalent in Eastern Cuba by its thin texture, 

 sculpture and coloration. It is one of the largest and finest of the 

 Cuban species. 



The coloration is very well shown in the figure. Besides the 

 profuse and fine mottling with white there are occasional longitudinal 

 white flames, bordered on the left side with dark, unmarked spaces. 



Chondropoma hendersoni n. sp. Pi. 4, fig. G. 



The shell is umbilicate, conic-turrite, narrowly truncate, rather 

 solid. Last four whorls rather closely and subregularly marked 



