76 



Mss. names are not quotable as having the value conferred by author- 

 ship, and the name must stand as above. It is unfortunate that the de- 

 scriptions of several of the new marine species of shells from Jamaica 

 should have been suppressed, in deference to the eminent authority- 

 above mentioned, and distributed with erroneous names. 



Descriptions of supposed new species and varieties of terres- 

 trial SHELLS, which inhabit Jamaica. By C. B. Adams, Feb. 1850. 



Most of the following species have been received from the Hon. 

 Edward Chitty, to whom, on this and on former occasions, I have 

 been greatly indebted for several new species, and especially for in- 

 formation respecting the distribution of the species over this island. 

 For similar favors I am also indebted to the Rev. F. R. Holland and 

 Mrs. Holland, to Miss Agnes Hines, Dr. J. S. Hyde, and to James 

 MacMurray, Esq. The details of such acknowledgements, the facts 

 communicated, my own observations on the varieties, distribution, 

 habits, &c. of the species, as well as their synonymy and the correc- 

 tion of errors, are mostly reserved for the monograph to which these 

 papers are preliminary. It is proper to make this statement here, 

 lest I should appear forgetful of the kindness of many friends, who in 

 various ways are aiding me in this work. 



Helix ingens. Shell transversely ovate, convex above, more 

 convex beneath, concave next the periphery below, and also above 

 except in the last half of the last whorl ; with a very acute periphery : 

 above reddish brown of shades varying in different individuals and 

 in different parts of the same shell, usually paler on the last whorl ; 

 beneath dark reddish or blackish brown next the periphery, whitish in 

 the rest; lip reddish brown : surface strongly granulated beneath, ex- 

 cept at the margin of the umbilicus ; above more feebly granulated, 

 smooth on the upper whorls and on the upper part of the lower 

 whorls : spire convex, moderately elevated : whorls a little more than 

 five, convex next below and concave next above the suture, with a 

 very uneven surface : aperture subtriangular : labrum reflected and 

 thickened ; on the middle of the lower side with (usually ?) two rath- 

 er distant stout teeth, the inner of which is (frequently?) accompa- 

 nied by a contiguous small tooth : umbilicus large and deep, scarcely 

 contracted except quite near the apex, where it consequently termi- 



