VOL. 1X: MARCH, 1896. No. 11 
NEW FLORIDA UNIOS. 
BY BERLIN H. WRIGHT, PENN YAN, N. Y. 
Unio Hartwrightii sp. nov. PI. II, figs. 4, 5, 6. 
Shell smooth, elliptical, inflated, pointed or subbiangulated pos- 
teriorly, well rounded anteriorly, inequilateral; rather thin and 
hard, slightly thicker in front; beaks very prominent, with two or 
three obscure wide undulations in one series; epidermis dark chest- 
nut-brown with faint green rays, more or less disposed in fascicles 
over the entire disk; growth lines barely distinct ; umbonial slope 
raised into an abrupt high ridge on the upper half, and rounded 
and flattened below; dorsal area wide, carinate, nearly cordate and 
usually with numerous heavy wrinkles or sharp folds; cardinal 
teeth double in the left and simple in the right valve, divergent, 
crested, rather short and subcompressed ; lateral teeth long, striate 
and thin; nacre pinkish-purple and in concentric zones towards the 
margins, highly iridescent, and especially so on the posterior half; 
cavity of the umbones rather deep; posterior cicatrices confluent, 
anterior ones distinct, and the dorsal ones few and in a short line 
under the hinge plate. 
Hab., Lake Beresford, Florida. 
Types in the collection of the author, cabinet of Mrs. Geo. An- 
drews, Knoxville, Tenn. and Museum Acad. Nat. Sciences, Phila. 
