47 



that of the preceding species. It was obtained in 

 East Florida, from an Indian, by Dr. Blanding, and 

 to this worthy naturalist the species has been pro- 

 perly dedicated. 



UNIO PERSONATUS. 



Plate XXIV. 

 DESCRIPTION. 



Shell sublenticular; length rather more than the 

 height; anterior margin forming with the basal mar- 

 gin a regular curve to the termination of the umbo- 

 nial slope; posterior side narrowed; posterior margin 

 subtruncated; umbo rounded, very prominent, subme- 

 dial; umbonial slope swelling near the base, gaping 

 and denticulate on the margin; epidermis with nu- 

 merous capillary rays, profound and undulated on 

 the posterior side; within pink; cardinal teeth direct, 

 thick, prominent; lateral teeth slightly recurved; cavity 

 of the beak not profound. 



SYNONYMES. 



U. personatus, Say. New Harmony Disseminator, p. 309, 1829. 

 U. capillaris, Lea. Trans. Amer. Philos. Soc. new series, vol. 



v. p. 29, pi. 2, fig. 2, 1832. 

 Cab. A. N. S. No. 1382. 



OBSERVATIONS. 



It would seem from the observations of Dr. Kirt- 

 land, that all those Uniones which have the peculiar 

 denticulated and dilated base, are female shells; and 



