

DESCRIPTIONS OF rOllTY-FOUil SUPPOSED NEW SPE- 

 CIES AND VARIETIES OF OPERCl'LATED LAND 

 SHELLS FROM JAMAICA. 



BY C. r>. AUAMS, 



Professor of Zoolojjy, etc., in Amherst College, Massachusetts.* 



S E I'T u; x^I B E R , 18 49. 



1. Cyclostoma Chittyi. This species differs from C. fimbriatuhtm 

 Sowb. in the smaller and more closely set spiral carina, of which there 

 are three more on each whorl, — and by the scollops of the outer per- 

 itreme, which are smaller and more numerous, corresponding with the 

 carinas. 



The many individuals of C. fimbriatulum which I have seen are 

 quite constant in their peculiarities. Of C. Chittyi, however, I have 

 but one individual. The value of the species will be more certainly 

 established by the discovery of additional specimens. 



2. Cyclostoma spinulosum. Shell short, globose-conic; dingy 

 white, with several more or less interrupted brown spiral lines ; with 

 crowded transverse thin perpendicular lamellai, which are decussated 

 by numerous rather strong raised spiral lines, of which three about the 

 middle of the whorls are larger ; the points resulting from the decus- 

 sation are elevated into minute spines where protected in the angle of 

 the deep suture ; spire with very convex outlines; apex usually trun- 

 cate with the loss of two whorls ; three and one half whorls remain- 

 ing, very convex; last whorl a little detached from the penult whorl 

 near the aperture, but soldered to it by the outer peritreme ; aperture 

 exactly circular ; inner peritreme much produced, striated parallel to 

 the edge on the outside ; outer peritreme moderately expanded and 

 reflected convexly back of the plane of the aperture, finely scolloped 

 with the ends of the spiral lines, and deeply striated parallel to the 



* The writer is engaged in the preparation of a monbgraph of the land shells 

 of Jamaica, and will thankfully , receive any criticism or information, which may 

 promote its completeness and correctness. 



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