ae 
278 DESCRIPTION OF NEW 
Hab. Lake George and Lake Munroe, Florida. S. B. Buckley. 
My cabinet and cabinets of Dr. Budd and Mr. Buckley. 
Diam. 1.3, Length .2, Breadth 3.9 inches. 
Shell oblong, compressed, inequilateral, subbiangular behind; substance of the shell 
rather thick; beaks rather prominent; ligament long and rather thick; epidermis almost 
black, smooth on the superior part of the disk; cardinal teeth large and lamellar, single 
in the right and double in the left valve; lateral teeth long and nearly straight; anterior 
cicatrices distinct, posterior cicatrices confluent; dorsal cicatrices in the centre of the 
cavity of the beaks; cavity of the shell shallow; cavity of the beaks small; nacre purple 
and very iridescent. > 
Remarks.—But two individuals of this species are before me, one of which is much 
younger than the other. In outline and general characteristics it resembles U. compla- 
natus. It will, no doubt, be found with white and salmon-coloured nacre. In the larger 
specimen the anterior dorsal margin is somewhat truncate, and there is a like disposition 
in the younger one. 
Unio Trossutus, Pu. 40. Fic. 6. 
Testa obliqud, cuneatd, inflata, valde inequilaterali; posticé subangulatd; valvulis crassis; nalibus prominulis, undulatis; 
epidermide nitidd, luted, radiatd; dentibus cardinalibus parvulis; lateralibus rectis subbrevibusque; margarita albd et valde 
tridescente. 
Shell oblique, wedge-shaped, inflated, very inequilateral, subangular behind; valves thick; beaks somewhat 
prominent, undulated; epidermis polished, yellow, radiated; cardinal teeth rather small; lateral teeth straight and 
rather short; nacre white and very iridescent. 
Hab. Monroe Lake, Florida. S. B. Buckley, 
My cabinet and cabinets of Dr. Budd and Mr. Buckley. 
Diam. .6, Length .8, Breadth 1.4 inches. 
Shell oblique, wedge-shaped, inflated, very inequilateral, subangular behind; umbonial 
slope rounded; substance of the shell thick; beaks somewhat prominent, and beautifully 
undulated at the tip; ligament short and very thin; epidermis smooth, polished, yellow, 
with dark green rays on the posterior portion; carditial teeth rather small, double in both 
valves; lateral teeth straight and rather short; anterior cicatrices distinct; posterior cica- 
trices confluent; dorsal cicatrices placed across the cavity of the beaks; cavity of the 
shell rather deep and rounded; cavity of the beaks small and subangular; nacre pearly 
white and beautifully iridescent. 
Remarks.—A single individual only of this beautiful and distinct little species is 
before me. It has somewhat the form of Unio Troostensis, (Nobis,) but may easily be 
distinguished from that species by its rays, and the undulations of the beaks. In this 
specimen the anterior portion is yellow with obsolete rays, the posterior portion is dark- 
green with closely set rays, which are, near the margin, so intense as to give a beau- 
tiful deep green border to the interior margin. The undulations of the beaks are nume- 
rous, beautifully regular, and double. The nacre is very unusually pearly and brilliant. 
There is a third distinct cicatrix, resembling that in the U. minor, herein described. The 
