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 Harmon y Disseminator, p. 509, 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 



