36 NEW UNIONID.E OF THE 



the latter, and is more transverse than the former. It is not so stout as Forhesiamis, 

 nor so great in diameter towards the beaks, and it has a darker epidermis, which is 

 more shining. Neither of the specimens have anything like rays, while in the other 

 two species obscure rays may usually be seen. It bears also some resemblance to 

 fumatm (nobis). There is a slight disposition to duplication in the cardinal tooth of 

 the right valve. 



Uxio COMPACTUS. PI. 28, tig. 98. 



Testa loevi, triangular!, subinflatfi, ad latere planulata, postie^ angulata, inserjuilaterali ; valvulis crassis ; 

 natibus elevatis ; epidermide luteo-oliva, radiis maculatis capillaris creberrimis ; dentibus cardinal- ' 

 ibus parvis, erectis, in utroque valvule duplieibus ; lateralibus curtis, crassis reetisque ; margarita alba 

 et iridesceiite. 



Shell smooth, triangular, somewhat inflated, flattened at the sides and angular 

 behind, inequilateral; valves thick; beaks raised; epidermis yellowish olive, with 

 hair-like, spotted, thickly set rays ; cardinal teeth small, erect and double in both 

 valves ; lateral teeth short, thick and straight ; nacre white and iridescent. 

 Proc. Acad. Nat. Sci., 1859, p. 154. 



Ilab. — Etowah River, Georgia, Bishop Elliott and Rev. G. White, and Connasauga 

 River, Bishop Elliott. 

 Diam. -7, Length 1, Breadth I'o inches. 



Shell smooth, triangular, somewhat inflated, flattened at the sides, angular behind 

 and inequilateral ; substance of the shell thick, very little thicker before ; beaks raised, 

 thickened and flattened towards the top ; ligament very short, thick and brown ; 

 epidermis yellowish olive, striate below, and smooth and shining above, nearly covered 

 with hair-like, spotted rays ; umbonial slope raised, obtusely angular and in the female 

 much enlarged and crenulate at its basal termination ; posterior slope wide, with 

 numerous, very small indented lines from the beaks to the posterior margin ; cardinal 

 teeth small, erect, compressed, crenulate and double in both valves; lateral teeth 

 short, thick, straight, abrupt at the end and remarkably arched at the plate joining 

 the cardinal tooth ; anterior cicatrices distinct and well impres.sed ; posterior cicatrices 

 distinct and moderately impressed; dorsal cicatrices placed across the base of the 

 cardinal tooth and in the cavity of the beaks; palleal cicatrix generally well 

 impressed, with an indented line below the great posterior cicatrix ; cavity of the shell 

 rather deep and rounded ; cavity of the beaks shallow and obtusely angular ; nacre 

 white and iridescent. 



Remarls. — Quite a number of this species were sent to me by Bishop Elliott and 

 the Rev. Mr. White. It is a remarkably compact, solid little shell and not easily 

 confounded with other species. In outline it is near to Foremanianus (nobis), but it 

 is smaller and not so compressed, and in the character of the rays totally different, 

 the Foremanianus having many capillary lines, while the compactus has them straight 



