FRESH WATER AND LAND SHELLS. 29 
in regard to undulations, cannot be ascertained. In general outline and characteristics, 
it is allied to U. luteolus, Lam. It is, however, thinner and lighter in the substance of 
the shell, and the rays are not so broad. The teeth, too, are smaller, and the lateral are 
much more removed from the cardinal ones. In the two specimens before me the division 
of the lateral teeth is remarkably short, not reaching more than half the length of the 
tooth. ' 
I dedicate this species to Lovell Reeve, Esq., the able author of “ Conchologia 
Iconica.” 
Unio turiwus. Pl. XX. Fig. 29. 
Testa levi, ellipticd, compressa, valdé inequilaterali, postice subbiangulata; valvulis subcrassis ; natibus 
parvis, vix prominulis epidermide tenebroso-bruned, striata, eradiata; dentibus cardinalibus parvis, acumi- 
natis; lateralibus longis curvisque; margarita vel cerulea-alba vel salmonis colore tincta. 
Shell smooth, elliptical, compressed, very inequilateral, subbiangular behind; valves somewhat thick; beaks 
small, scarcely prominent; epidermis dark-brown, striate, without rays; cardinal teeth small, acuminate; lateral 
teeth long and curved; nacre bluish-white or salmon-coloured. 
Hab. Coosawattee river, Murray county, Georgia, Dr. Boykin. 
My cabinet. 
Diam. .6, Length 1, Breadth 2 inches. 
Shell smooth, elliptical, compressed, very inequilateral, subbiangular behind; substance 
of the shell somewhat thick; beaks small, scarcely prominent, placed towards the anterior 
margin; ligament rather long and thin; epidermis dark-brown, striate, without any appa- 
rent rays, with rather distant marks of growth; posterior slope rather compressed; um- 
bonial slope very slightly raised into a scarcely visible angle; cardinal teeth small, acumi- 
nate, double in the left and single in the right valve; lateral teeth long, curved and 
enlarged at the posterior end; anterior cicatrices distinct; posterior cicatrices confluent; 
dorsal cicatrices placed above the centre of the cavity of the beaks; palleal cicatrices 
slightly impressed; cavity of the shell very shallow; cavity of the beaks exceedingly shal- 
low and rounded; nacre bluish-white and salmon coloured. 
Remarlss.—Some half dozen of this small, unattractive species I owe to the kindness of 
my late friend, Dr. Boykin. Two of them are slightly salmon coloured, the others are 
bluish-white. It is somewhat like U. complanatus ; but, in outline, it is more like occultus, 
(Nobis,) the beak is more terminal than in either, and the whole appearance of the shell 
reminds one of WU. arctior, (Nobis,) but it is not so wide a shell. Several of the speci- 
mens are not so dark a brown as the others, but are inclined to dark-olive. 
Unto Crarxianus. PI. XXI. Fig. 30. 
Testa levi, elliplicd, convead, ad umbonis inflata, inequilaterali, postice angulata; valvulis crassis; natibus 
subprominentibus, subrotundis; epidermide rufo-fusca, nitidd; dentibus cardinalibus subcrassis, acuminatis, 
granulalis; lateralibus subbrevibus, crassis, arcuatis; margarita vel alba vel salmonis colore tincta et 
iridescente. 
Shell smooth, elliptical, convex, on the umbones inflated, inequilateral, angular behind; valves thick; beaks 
rather prominent, subrotund; epidermis reddish-brown, shining; cardinal teeth rather thick, acuminate, granular; 
lateral teeth rather short, thick and arched; nacre white or salmon coloured and iridescent. 
