NEW FRESH WATER AND LAND SHELLS. 245 



Remarks. — This species is most nearly allied to U. glans, nobis, but is larger, 

 more transverse, and has a rougher epidermis. In the purple nacre they re- 

 semble each other — The beaks of the two specimens before me are eroded, and 

 therefore the character of the tips cannot be given. One of the specimens is 

 less elliptical than the other, and disposed to be angular behind. 



Unio Brumbyanus. Plate 26, Fig. 62. 



Testa ellipticd, inflald, inaquilaterali, postice suhhiangulald ; valuulis crassis; epidermide nigra, 

 polita; dentibus cardinalibus suhgrandibus, lateralibus brevibus subrectisque; margarita alba et iri- 

 descente. 



Shell elliptical, inflated, inequilateral, subbiangular behind; valves thick; epidermis black, polished; 

 cardinal teeth rather large ; lateral teeth short and straight; nacre white and iridescent. 



Hab. Warrior River, Tuscaloosa, Alabama. Prof. Brumby. 



Cabinet of Dr. Griffith. 

 Diam. .6, Length .8, Breadth 1.2 inches. 



Shell elliptical, inflated, inequilateral, subbiangular behind, disposed to 

 be biangular on the umbonial slope, raised on the umbones; substance of 

 the shell thick, thinner behind; ligament thin and short; epidermis black, 

 polished and shining on the superior portion; cardinal teeth rather large, 

 conical, single in the right and double in the left valve; lateral teeth short and 

 straight; anterior cicatrices confluent; posterior cicatrices confluent; dorsal 

 cicatrices placed on the under side of the plate between the cardinal and 

 lateral teeth ; cavity of the shell rather deep ; cavity of the beaks rather deep 

 and angular; nacre pearly white and iridescent. 



Remarks. — This little species exteriorly resembles JJ. glans, nobis, but is 

 rather more angular, and is higher on the umbones, — interiorly it differs in 

 having a white nacre. It is to be regretted that the only specimen sent is in 

 the beaks quite imperfect. This is the only Unio sent to Dr. Griffith by Prof. 

 Brumby, and to him I dedicate it. 



