FRESH WATER AND LAND SHELLS. 35 
it really is there enlarged. The position, therefore, of the oviducts of the animal, which 
I have not seen, must be different. Judging from this single specimen, I should think it 
will prove to be a much smaller species than the foliatus of the Ohio. 
I name it after Dr. Stewardson, to whosé exertions we are indebted for its discovery. 
Unio Hanteyianus. PI. XXIII. Fig. 37. 
Testé levi, obliqua, tumidd, valde inxquilaterali, postice angulaté ; valvulis percrassis ; natibus grandibus, 
tumidis; epidermide bruneo-oliva, striald, eradiatd; dentibus cardinalibus parvis, pyramidatis ; lateralibus 
brevis rectisque; margarita alba et iridescente. 
Shell smooth, oblique, swollen, very inequilateral, angular behind; valves very thick; beaks large and 
swollen; epidermis brownish-olive, striate, without rays; cardinal teeth small, pyramidal; lateral teeth short and 
straight; nacre white and iridescent. 
Hab. Coosawattee river, Murray county, Georgia. Dr. Boykin. 
My cabinet. 
Diam. .8, Length .9, Breadth 1.4 inches. 
Shell smooth, oblique, swollen, very inequivalve, angular behind; substance of the shell 
very thick, much thinner behind; beaks large, swollen and placed towards the anterior 
margin; ligament short and thin; epidermis brownish-olive, striate, without rays and with 
close marks of growth; posterior slope wide and rather depressed ; umbonial slope raised, 
very obtusely angular; cardinal teeth small, pyramidal, single in the right, and double in 
the left valve; lateral teeth short, straight and in a direction much above the cardinal 
tooth; anterior cicatrices distinct and deeply impressed; posterior cicatrices distinct; 
dorsal cicatrices on the under side of the plate; palleal cicatrix impressed; cavity of the 
shell deep and irregularly oval; cavity of the shell shallow and obtusely angular; nacre 
white and iridescent. : 
Remarks.—Three or four specimens are before me, differing very little from each other. 
The marks of growth are unusually close together, and are much darker than the inter- 
space, which is brownish-olive. It is a pretty little species, and is allied to U. decisus, 
(Nobis,) and scalenius, Raf., and approaches U. pulvinulus, (Nobis.) It differs from the first 
in not having the beaks so terminal, and not being so much swollen on the anterior por- 
tion of the disk; from the second, in not having the beaks so terminal, in being more 
oval and in being without rays. From the last it differs in being less rounded, of a lighter 
colour, and having the marks of growth closer. 
I dedicate this species to Sylvanus Hanley, Esq., one of the authors of “ History of 
British Mollusca,” &c. 
Unio pracitus. PI. XXIII. Fig. 38. 
Testa levi, elliptica, subinflata, inxquilaterali, postice subangulata ; valvulis subcrassis; natibus subpromi- 
nentibus, rotundatis; epidermide castaned, nitidd, obsolete radiata; dentibus cardinalibus subparvis, compres- 
sis, per obliquis, crenulatis ; lateralibus sublongis, lamellatis curvisque; margarita salmonis colore tinctd. 
Shell smooth, elliptical, rather inflated, inequilateral, subangular behind; valves a little thick; beaks some- 
what prominent, rounded; epidermis chestnut-coloured, shining, obsoletely rayed; cardinal teeth rather small, 
compressed, very oblique, crenulate ; lateral teeth rather long, lamellar and curved; nacre salmon coloured. 
