22 DESCRIPTION OP NEW 



Remarks. — I owe to the kindness of Dr Ruschenberger, of the 

 United States navy, the interesting and curious specimen above de- 

 scribed. It vras purchased by him in Rio de Janeiro, its exact habitat 

 being unknovpn to him, having been kept perfectly secret by the per- 

 son from whom he obtained it. The remarkable elevation of this 

 shell eminently distinguishes it from any species with which I am ac- 

 quainted. The lower portion of the mouth is slightly thrown back, 

 and where the lip joins the bottom of the columella, it is reflected on 

 the whorl, forming a false umbilicus. From this point three connect- 

 ed folds pass into the interior of the cavity of the shell, and half way 

 up the columella a larger and better defined fold is placed, which in 

 the front aspect has the appearance of a tooth. The whorls are slight- 

 ly curved, and the aperture is about one-sixth the length of the shell. 



Paludina pallida. Plate XXIII. fig. 104. 



Testa ventricosa, tenui, pallida, lavi; suturis impressis ; anfradibus quatemis, contexts; 

 apertura subrotunda. 



Shell ventiicose, thin, light hoiii-colour, smooth; sutures impressed; whorls four, 

 convex; aperture nearly round. 



Hab. near Cincinnati, Ohio. T. G. Lea. 



My Cabinet. 

 Diam. -3, Length -4 of an inch. 



Remarks. This shell has been recently found by my brother, and 

 I believe has not before been observed. It might at first be mistaken 

 for a young shell, on account of its pale yellow colour and translucen- 

 cy. In form, however, it differs from any species I have examined, 

 the last whorl being very much enlarged, and the aperture being very 

 large. 



