﻿UNITED STATES. GO 



Soft Parts. — Branchial uterus filling the whole length of outer branchiae. Bran- 

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

 thirds the length oi 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 papillae. Anal opening small, with very minute papillae. Super-anal opening 

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

 whitish, inclining to a salmon colored tint. 



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

 Elliott. It is allied to sagittazformis (nobis) and to Fisherianus (nobis). 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 tuberculate, quadrata, inflata, subinsequilaterali, postice truncata et emarginata, ad basim emargi- 

 nata, in medio sulcata ; valvulis percrassis antice" crassioribus ; natibus prominentibus, compressis, 

 incurvis, ad apices rugoso-undulatis ; epidermide tenebroso-castanea. ; dentibus cardinalibus crassissi- 

 ruis, crenulatis, in utroque valvule- duplicibus; lateralibus brevibus, percrassis rectisque ; margarita 

 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. 



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



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

 Diam. 2, Length 3*2, Breadth 3-4 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 on 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 ; cardinal 

 teeth enormously thick, crenulate, elevated and double in both valves ; lateral teeth, 



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