﻿270 DESCRIPTIONS OF 



haps nearest in outline to U. rubiginosus (nobis). It is with pleasure I name it after 

 the gentleman who brought it from its native habitat, from which country he escaped 

 after so many perils. 



Unio Nagpookensis. PL 45, fig. 150. 



Testa laevi, subtriangulari, subinflatsl, insequilaterali, postice biangulata, antice rotunda ; valvulis sub- 

 tenuibus, antice crassioribus ; natibus prorninentibus , epidermide rufo-fusca, striata, eradiata ; dentibus 

 cardinalibus parvis, compressis, obliquis crenulatis, in utroque valvulo duplicibus; lateralibus longis, 

 lamellatis curvisque ; margarita, salmonis colore paulisper tincta, et iridescente. 



Shell smooth, subtriangular, somewhat inflated, inequilateral, biangular behind ; 

 round before ; valves rather thin, thicker before ; beaks prominent ; epidermis 

 reddish brown, striate and without rays ; cardinal teeth small, compressed, oblique, 

 crenulate and double in both valves ; lateral teeth long, lamellar and curved ; nacre 

 light salmon color and iridescent. 



Unio Nagpoorensis, Lea. Proc. Acad. Nat. Sci. 1859, p. 331. 



Hob. — Ambajiri Tank, Nagpoor, Bengal, C. M. Wheatley. 



Cabinet of Mr. Wheatley. 

 Diam. 1, Length 1*5, Breadth 2*3 inches. 



Shell smooth, subtriangular, somewhat inflated, inequilateral, biangular behind, 

 round and much striate before ; substance of the shell rather thin, thicker before ; 

 beaks prominent ; ligament rather short, somewhat thick ; epidermis reddish brown, 

 striate, without rays, with rather close marks of growth, which are slightly raised ; 

 umbonial slope slightly raised and disposed to be biangular ; posterior slope slightly 

 raised, rather wide, with small folds on the upper part; cardinal teeth small, com- 

 pressed, oblique, crenulate and double in both valves ; lateral teeth long, lamellar and 

 curved ; anterior cicatrices distinct and rather deeply impressed ; posterior cicatrices 

 confluent and very slightly impressed ; dorsal cicatrices situated on the under side of 

 the plate and across the base of the cardinal tooth ; cavity of the shell rather deep and 

 rounded ; cavity of the beaks rather deep and subangular ; nacre light salmon color 

 and iridescent. 



Remarks. — A single specimen only was received by Mr. Wheatley, the beaks of 

 which are much eroded and therefore the character of them cannot be described, but 

 from the nature of the small folds which remain on the non-eroded part of the posterior 

 slope, I suspect that in perfect specimens the tips would be found to be finely undulate. 

 The cardinal teeth are rather of an unusual form, that in the right valve having the 

 upper portion long and lamellar, the lower lobe diverging from the middle in a 

 curve, and it is here thickened. The thickening of the anterior portion of the valves 

 is unusual. In this specimen it embraces only the anterior third of them. Usually 

 where this thickening exists it embraces one-half or two-thirds of the valve. This 

 thickening is also very abrupt in the cavity of the shell. The umbonial slope shows 



