Varieties of Land and Fluviatile Shells of Jamaica. 5 



ere I attempt to describe all the specimens which have come 

 to my hands, unseen by, and so unknown to, the Professor 

 at the time of his lamented death ; but I venture to describe 

 three, namely, G. sinuosa, G. inornata^ and G. parva, 

 which I select from among the rest by the marked pecu- 

 liarity of their spiral striae. 



GEOMELANIA SINUOSA. Shell conic, cylindrical, white, 

 elegantly sculptured with very sharp and slender transverse 

 ribs, which lessen in number on the last whorl, and which 

 are very slightly impressed with very numerous micros- 

 copic spiral striae. Spire with rectilinear outlines. Apex 

 truncate, with the loss of ? whorls ; six whorls re- 

 maining, convex, with a deep suture. Aperture ovate, 

 moderately effuse on the right side, angular above, 

 oblique. Labrum thickened, and sharply reflected, not 

 produced. Labium detached from the last whorl. At the 

 top of the aperture, separating the labiuin from the labrum 

 is a very singular sinus, which induces its specific name, 

 opening as a narrow line, and terminating as an open 

 circle (which I can best describe by likening it to the 

 peculiarities of a surgeon's amputating saw) ; round the 

 outside of this circle the edge is much thickened. 



Mean divergence about 16, Length .22, Breadth .05. 



Habitat, Ashly Hall, Trelawny. 



GEOMELANIA INORNATA. Shell elongate, conic, cylindri- 

 cal, white ; to the naked eye it appears smooth and without 

 ribs, but under the lens, it has strong, rounded, close set, 

 transverse ribs. Spire with rectilinear outlines. Apex 



truncate, with the loss of ? whorls ; whorls left 5 } 



very convex, with a moderately impressed suture. Aper- 

 ture ovate, angular above. Labrum effusely produced, and 

 widely reflected on the right. Below? (N. B. The 

 only specimen I have is broken in that part.) Labium 

 moderately thickened and reflected, and in its upper half 

 appressed to the penult whorl. A slight sinus divides the 

 labrum from the labium. 



Mean divergence about 13^ ; Length .36, Breadth .08. 



Habitat '. 



