LXITKU STATKS. t)5 



So/l Rtrts. — Branclddl nicrn-s lilling the whole length of outer branchiiv. Brau- 

 chia: very wide, gently curved below, the inner one somewhat the larger, free two- 

 thirds the length ot abdominal sack. Palpi small, subtriangular, united at the 

 upper part of the posterior edges. Mantle thin, thicker at the margin, without color 

 at the edge, emarginate at posterior end. Branchial opening very small, with small 

 brown papillfe. Anal opening small, with very minute papilla;. Super-anal opemnc/ 

 long, slightly colored inside, attached for some distance lielow. Color of the mass 

 whitish, inclining to a salmon colored tint. 



Remarhs. — Several specimens of this interesting species were sent to me by Bishop 

 Elliott. It is allied to .S(Z(7^WrR^;•w^^s (nobis) and to Fisher ianits {noh\s). It is more 

 slender and more transverse than the former, and is not so oblique as the latter, and 

 is not so angular on the umbonial slope, nor so acute at the posterior margin. It has 

 a graceful form, and is easily distinguished from these or any other species. 



Unio Blandianus. pi. 11, fig. 47. 



Testa tuberculata, quadratu, iiiflata, subinrequilaterali, postice truncatu ct emarginata, ad basim emargi- 

 nat:'i, in medio sulcatil ; valvulis percrassis antice crassioribus ; natibus promincntibus, compressi.s, 

 inourvis, ad apices rugoso-undulatis ; cpidermide tenebroso-castanea ; dentibus cardinalibus crassissi- 

 mis, crenulatis, in utroque valvulo duplieibus; lateralibus brevibus, percrassis reotisque ; raargarita 

 argentea et iridescente. 

 Shell tuberculate, quadrate, inflated, a little inequilateral, truncate and emarginate 

 behind, and at the base emarginate, furrowed in the middle ; valves very thick, 

 thickest before ; beaks very prominent, compressed, curved inwards, at the tips 

 rugosely undulate ; epidermis dark chestnut color ; cardinal teeth enormously thick, 

 crenulate and double in both valves ; lateral teeth very short, very thick and 

 straight; nacre silver white and iridescent. 

 Proc. Acad. Nat. Sci. 1856, p. 263. 

 Hah. — Othcalooga Creek, Gordon County. Georgia. Bishop Elliott. 

 My cabinet and cabinets of Bishop Elliott and Mr. Bland. 

 Diam. 2, Length 3-2, Breadth 34 inches. 



Shell tuberculate, quadrate, inflated, very nearly equilateral, truncate and emargi- 

 nate behind and sharply emarginate at base, with a rather deep furrow from beak to 

 near the middle of basal margin, rounded before ; substance of the shell exceedingly 

 thick and ponderous, much thicker before ; beaks very prominent, compressed, curved 

 inwards, at the tip rugosely undulate or granulate ; ligament rather short and very 

 thick; epidermis dark chestnut, shining, with distant marks of growth ; tubercles over 

 nearly the whole of the anterior half of the disk and oa the posterior .slope, where 

 they are arranged in curved rows ; the umbonial slope is raised into a ridge, rounded, 

 free from tubercles and has a wide furrow before and a small one behind; caidinal 

 tiH'th enormou.slv thick, crenulate. elevated and double in both valves ; lateral teeth. 



