FRESH WATER AND LAND SHELLS. 73 



Remarks. — Dr. Budd submitted three specimens of this species to my inspection. They 

 arc of various ages, and neither of them have a single ray. The youngest is more yellow 

 than the others. It is nearly allied to U. simj,!> r. herein described, but differs from that 

 species in being less heavy, in having no rays, and in being flatter on the side. It answers 

 near!} to the description of .Mr. Conrad's / Greenii, but does not agree with his figure, 

 which is more rounded, and has rays. 



Unio fulgidus. PI. IV. Fig. 10. 



Testa leevi, triangulari, infiatd; valvulis crassis; nalibus magnis elrvatisf/uc; epidermide tenebroso -fused, 

 politd, radiutd; dentibus cardinalibus parvis; later atibus crassis reclisque; margaritd alba ct iridescente. 



Shell smooth, triangular, inflated; valves thick ; beaks large and elevated; epidermis dark-brown, polished, 

 rayed; cardinal teetli small; lateral teeth thick and straight; nacre white and iridescent. 



Ilab. Alexandria, Louisiana. J. Hale, M. D. 



My cabinet and cabinets of Dr. Hale and T. G. Lea. 

 Diam. .8, Length 1.1, Breadth 1.2 inches. 



sholl smooth, triangular, inflated, subangular on the umbonial slope, nearly equilateral; 

 substance of the shell thick, thinner behind; beaks large and elevated; ligament short and 

 thin; epidermis dark-brown, finely polished, with obscure rays, and regular, equidistant. 

 marks of growth; cardinal teeth small, lateral teeth short, thick, and straight; anterior 

 cicatrices distinct; posterior cicatrices distinct; dorsal cicatrices placed nearly in the 

 centre of the cavity of the beaks; cavity of the shell very shallow; cavity of the beaks 

 -hallow and subangular. Nacre white and iridescent. 



Remarks. — This is a small species of which I received one specimen and an odd valve 

 from my brother, T. G. Lea, who received them from Dr. Hale. This species is allied 

 to U. tumescens, (Nobis.) herein described. It diners in being less flattened on the sides, 

 in not having an angular umbonial slope, in having a more fine polish, and in the rays 

 being more obscure. 



Unio stmmetricus. PI, IV. Fig. 11, 



/'• ltd la ri, oblongd, subeompressd ; valvtilis subcrassis; nalibus subprominentibus ; epidermide tenebroso- 

 fuscii: dentibus cardinalibus compressis,elevalis,acuminalis; laleralibus longis, lamellatisque; margaritd alba. 



Shell smooth, oblontj, rather compri ssi I; valves somewhat thick; beaks somewhat prominent; epidermis dark- 

 brown; cardinal teeth compressed, elevated, and pointed; lateral teeth long and lamellar; nacre white. 



Ilab. Red lliver, at Alexandria, Louisiana. J. Hale, M. D. 



M\ c abinet and cabinet of Dr. Hale. 

 Diam. LI, Length 1.8, Breadth 3.2 inches. 



Shell smooth, oblong, rather compressed, angular behind and rounded before, cannatc 

 on the ]>■ isterior -lope; substance of the shell rather thick and regular on the interior sur- 

 face; beaks 30tnewha1 prominent; ligamenl very long and rather thin; epidermis dark- 

 brow n, polished on the umbones, and wrinkled along the margin; cardinal teeth compressed, 

 elevated, pointed, Bingle in the right and double in the left valve; lateral teeth long, 

 lamellar, thickened in the left valve and slightly recurved; anterior cicatrices distinct; 

 \ oi . \. — 1!» 



