184 AMERICAN JOURNAL 



Cylindrella seminuda, C. B. Adams. 



Lingual membrane resembling that of the true Cylindrella 

 (Group A), of Messrs. Crosse and Fischer. The inner lateral 

 has an obsolete upper cusp, and the outer lateral has, instead of 

 the usual cusp, a simple, short, obtuse point, thrown off laterally 

 near its summit. Thus it will be seen that this lingual mem- 

 brane resembles that of C. gracilis, figured by Messrs. Crosse 

 and Fischer (1. c. pi. iv, p. 1). 



Jamaica. Mr. Gloyne. 



SUCCINEA SAGRA, D'Orb. ? 



Jaw as usual in the genus, its anterior surface simple ; with a 

 median projection to its cutting edge. 



Lingual membrane as usual in the genus ; teeth short, stout ; 

 marginals with one long and several short acute cusps. 



Jamaica. 



Stoartoma pisum, Ad. 



Lingual membrane long and narrow. Teeth 000.5.1.5.000, 

 resembling those of the genus Helicina. 



Specimens received from Mr. Gloyne, collected in Jamaica, 

 furnished the lingual membranes here described. 



