CONTEIBUTIONS TO CONCHOLOGY. 



NO. 9. 



[From Annals of N. Y. Lyceum of Natural Hist. Vol. V. No. 3.] 



Descriptions of New Species and Varieties of the Land Shells 

 <?/ Jamaica, with Notes on some previously described Species. 

 By C. B. Adams, Professor of Zoology in Amherst College, 

 Massachusetts. April, 1851. 



The writer has recently sjjent some time in Kingston, Ja- 

 maica, in arranging the land shells of that island, which are 

 in the collections of the Honorable Edward Chitty, and in se- 

 lecting from them materials for the proposed monograph of 

 Jamaica shells, ximong them are several new species and va- 

 rieties, whicli have recently been obtained by Mr. Chitty, and 

 which, with some previously known, are described in this 

 article.* 



Cyclostoma Hillianum, var. leporilabre. This variety 

 is distinguished by having an abrupt reflection of a small part 

 of the outer peritreme next above its contact with the penult 

 whorl. The outer peritreme is also very much c.xpan.led, and 

 is somewhat sinuate, above. 



Cyclostoma spinulosum (p. 1 of Contributions to Conch.) is 

 perhaps idt^ntical with C. lincinellum, Lam., if we may judge 

 from the figures of Lamarck's species in Kuster';* " Cy^•lo^;to- 

 uiacea." 



Cyclostoma Mousso^'(A^Ju.^^. Shell short, globosc.-eonie : 

 dingy wliite, with numerous more or less interrupted spiral 

 reddish brown lines: with inore or less crowJed transverse 

 subiinbricare iami'ihc, which are decussated by numerous 

 small spiral ridges, with tlie inrers(;ctions well dttveloped into 

 spines in the angle of the suture : spire with V(;ry convex out- 

 lines; apex usually truncate with the lo.ss of two whorls; re- 

 maining whorls three and one-half, very convex ; last whorl a 

 little detached from the penult whorl near the aperture, but 

 * This and the following articles -were prepavcd by tlie -writer while in King^tOD. 



No. 9—1 . 



