58 NEW UNIOXID.® OF THE UNITED STATES. 



what curved ; anterior cicatrices distinct, large and well impressed ; posterior cicatrices 

 confluent, large and slightly impressed ; dorsal cicatrices well impressed and placed 

 immediately over the centre of the cavity of the beaks ; cavity of the shell rather 

 deep and wide ; cavity of the beaks somewhat deep and rounded ; nacre white or 

 purple and iridescent. 



Remarks. — This species, in general form, is near to confertas (nobis) inclining to- 

 wards Bland iiiglaims (nobis). I have a specimen from Dr. Newconib, which seems 

 to be the same, and which he thinks came from Tennessee. 



Unio Catawbensis. pi. 1, fig. 200. 



Testa lajvi, quadrata, subinflatu, ad latere planulata, subemarginata, valdfe inaequilatorali ; valvulis sub- 

 crassis, antic^ crassioribus ; natibus promiuulis ; epidermide tenebroso-fusca; dentibus cardinalibus 

 Curtis, subcrassis, in utroque valvulo duplicibusj lateralibus subcrassis, prselongis subreetisque ; mar- 

 garita vel alba vel purpurea et irideseeute. 



Shell smooth, quadrate, somewhat inflated, flattened at the sides, subemarginate, 

 very inequilateral ; valves rather thick, thicker before ; beaks a little prominent ; epi- 

 dermis dark brown ; cardinal teeth short, rather thick, double in both valves ; lateral 

 teeth rather thick, very long and straight ; nacre white or purple and very iridescent. 

 Proc. Acad. Nat. Sci. 1857, p. 85, U. Wheatleyi.* 



i/«6.— Catawba River, Gaston Co., N. C. C. M. Wheatley. 



My cabinet and cabinet of Mr. Wheatley. 

 Diam. 1-1, Length 1-8, Breadth 3-6 inches. 



Shell smooth, quadrate, somewhat inflated, flattened at the sides, subemarginate, 

 very inequilateral, subbiangular behind; substance of the shell rather thick, thicker 

 before ; beaks a little prominent ; ligament long, thick and dark brown ; epidermis 

 dark brown, shining, roughly striate before, with distant marks of growth ; umbonial 

 slope raised and angular ; posterior slope carinate, rather broad : cardinal teeth short, 

 rather thick, striate and crenulate, double in both valves ; lateral teeth rather thick, 

 very long and straight; anterior cicatrices distinct, large and deeply impressed; pos- 

 terior cicatrices confluent, large and well impressed ; dorsal cicatrices deep and placed 

 in the centre of the cavity of the beaks ; cavity of the shell rather deep and wide ; 

 cavity of the beaks shallow and rounded; nacre white or purple, sometimes salmon 

 and iridescent. 



Remarks. — Several specimens were sent to me l)y Mr. Wheatley. It belongs to the 

 complanatus group, and closely resembles imllatus (nobis), but is more quadrate. The 

 umbonial slope is raised into a well marked rather acute angle, and the posterior slope 

 is yellowish, with obscure greenish rays. 



* Changed to Caiatvbensis, the name of ]V]u'atleyi being preoccupied. 



