42 



the color is yellowish brown or waxen : the aperture is similar to 

 that of Dr. Pfeiffer's species, but the tooth of the right side is less 

 conspicuous. 



Lengtli .12 inch; breadth .09 inch : of P. quadridens, length .10 

 ^nch; breadth .135 inch. 



Catalogue of Auricui.td/K which inhabit Jamaica. Oct. 1849. 



1. M. coniformis Brug. 



2. M. flavus Gm. Syn. Auricula monile Lam. 



3. M. pusillus Gm. Syn. Auricula uitens Lam. 



4. M. coronatus Ad, 



5. M. cingulatus Pfr. 



FSDIFSS. 



6. P. quadridens Pfr. j 7. P ovajis Ad. 



Descriptions of supposed new species of Fresh Water Shells' 

 which inhabit Jamaica. By C. B. Adams. Oct. 1849. 



Paludina Jamaicensis. Shell ovate-conic ; translucent or sub- 

 transparent ; green, sometimes with a tinge of brown ; very smooth ; 

 spire with the outlines nearly rectilinear ; apex acute, persistent ; 

 whorls six, quite convex, very regularly rounded ; aperture ovate, 

 acute above ; with an umbilical groove between the left side of the 

 lip and the last whorl. 



Mean divergence about 60°; length .15 inch; greatest breadth 

 .1 inch ; least breadth .08 inch. 



Valvata pvgm^a. Shell convex above ; concave below ; color* 



? with fine stria) of growth ; spire convex, moderately elevated ; 



apex subacute ; whorls three and one-half, with a very deep suture, 

 very accurately rounded and rather rapidly increasing in diameter, 

 so that the shell resembles an elongated cone wound in a spiral 

 manner; aperture large, with the upper end of the labrum advanced 



■' I have not yet obtained any fresh or living specimens. 



