Varieties of Land and jfrluviatile Shells of Jamaica. 13 



CYLINDRELLA ADAMSIANA. This shell may be likened to 

 C. nobilior Ad. in general appearance and shape, and (in 

 some of the lighter colored varieties) also in color, viz : 

 it is of a dingy light fawn, with a line of deeper fawn at 

 the suture, with a white lip. The main difference between 

 the two shells, is, that in this, the upper part of the peri- 

 tretne is not attached or soldered to the penult whorl as in 

 C. nobilior, but is produced, ^n size also there is a 

 general difference ; the largest out of some 60 odd specimens 

 of the latter, C. nobilior, measuring 1 .2 inch, while 

 the ordinary run of the former, is not less than 1 .3 inch .- 

 both shells are proportionally wide. Attaching some 

 importance to locality, the former is found at Durham, in 

 Trelawny, and the other in Bog Walks, St. Catherine's, 

 places some 50 miles apart, " as the crow flies." The 

 sculpture of this shell is generally much finer, and rather 

 more oblique. 



Both shells equally vary and agree in different specimens 

 as regards fusiformity. Of the longest out of a quantity or' 

 C. Adamsiana, the following are the measurements and 



other particulars : Apex truncate, with a loss of t 



AVhorls left, 9^. Length 1.4 inch, breadth at the third, 

 (from the last) whorl .4 inch. Thence it gradually tapers 

 to .2 inch on the ninth whorl. The keel at the buck of the 

 last whorl, or spiral carina, also, is much more developed 

 than in most others of the C. rosea tribe. In C. rosea, var. 

 'iiiayna (especially) and in C. columna, Client., and C. 

 "v/tata, Ad., the aperture is generally higher on the right 

 than loll side ; while in C. Ad<nusiana the reverse almost 

 universally occurs ; and in this latter shell the lower par! 

 of the inner or left lip is much broader and more flattened 

 and less reflected. 



Named in honor of my much lamented friend and con- 

 chological preceptor, the late Professor C. B. ADAMS, of 

 Aniherst College, Massachusetts, U. S. 



CYLINUKULLA DLMUA. Of the C. Rosen group. Shell, 

 .vatc conic, much elongated, dingy rujo color, Lip white : 



