190 NEW UNIONIDvE OF THE 



lateral teeth rather long, lamellar, suboblique and corrugate ; nacre whitish and 

 splendidly iridescent. 



Proc. Acad. Nat. Soil, 1861, p. 393. 



Hob. — Ogechee River, Georgia, Major Le Conte and J. G. Anthony. 



My cabinet and cabinet of Mr. Anthony. 

 Diam. -6, Length 1, Breadth 1-5 inch. 



Shell smooth, elliptical, compressed, inequilateral, obtusely angular behind, round 

 before ; substance of the shell rather thin, rather thicker before ; beaks a little 

 prominent ; ligament small, thin and light brown ; epidermis yellowish or yellowish 

 brown, polished and nearly covered with oblique green rays, some broad and others 

 almost capillary, with distant marks of growth ; umbonial slope slightly raised and 

 very obtusely angular ; posterior slope narrow elliptical, raised into a carina, covered 

 with numerous small rays ; cardinal teeth small, compressed, acuminate, crenulate 

 and double in both valves ; lateral teeth rather long, lamellar, somewhat oblique 

 and corrugate ; anterior cicatrices distinct, rather large and well impressed ; posterior 

 cicatrices confluent, moderately large and slightly impressed ; dorsal cicatrices placed 

 above the centre of the cavity of the beaks ; cavity of the shell rather shallow and 

 wide ; cavity of the beaks rather shallow and angular ; nacre rich satin-like and 

 splendidly iridescent. 



Remarks. — I have two specimens before me and neither may be full grown. The 

 larger is more perfect and has fine green rays nearly covering the disk to the margin. 

 These are so strong that they are visible in the interior through the nacre, which is 

 of remarkable beauty and brilliancy. The smaller and more imperfect one I have 

 had in my possession for some years, but, although satisfied it was new, I still 

 recognized it as young and imperfect. The better one from Mr. Anthony, which is 

 figured, is an inch and six-tenths wide by one inch long, and may not be full grown. 

 In outline it is almost exactly the same with U. Boroughianus, (nobis,) from South 

 America, but is not quite so angular posteriorly and is more regularly rounded 

 before. It reminds one also of a young crassideiis, Lam., and Forbesianus, (nobis,) 

 but it is more compressed and is not triangular in the outline as they both are. 



Unio Noethamptonensis. PL 25, fig. 260. 



Tests, lsevi, oblonga, valde compressS,, ad latere planulatS, postice obtuse biangulari, antiee oblique 

 rotundata, valde injEquilaterali; valvulis subcrassis, antiee crassioribus ; natibus proniinulis ; epi- 

 derniide vel oehracea vel luteo-fusca, oblique radiata ; dentibus cardinalibus crassis, ■ striatis, in 

 utroque valvulo duplicibus ; lateralibus praslongis, validis, corrugatis, subrectis lamellatisque ; rnar- 

 garitS, vel albii vel purpureseente vel salmonis colore tincta et valde iridescente. 



Shell smooth, oblong, very much compressed, flattened at the side, obtusely bian- 

 gular behind and very inequilateral ; valves somewhat thick, thicker before ; beaks 



