﻿19 -J NEW UNIONIDiE OF THE 



Bnh. — Flint River, near Macon, Geo. J. C. Plant and H. M. Neisler, M. D. 



My cabinet and cabinet of Mr. Plant. 

 Diam. *8, Length 1*2, Breadth 1*8 inches. 



Shell smooth, oblique, very much inflated, very inequilateral, obtusely angular 

 behind and regularly rounded before ; substance of the shell thicker before ; beaks 

 swollen and raised ; ligament short, thick and brown ; epidermis nearly black, 

 shining above and striate towards the margin, without rays, with obscure distant 

 lines of growth ; umbonial slope much raised and angular ; posterior slope flattened, 

 slightly wrinkled, with two obscure impressed lines on each valve ; cardinal teeth 

 rather large, somewhat pyramidal, slightly compressed and crenulate ; lateral teeth 

 short, rather thick, nearly straight and corrugate ; anterior cicatrices distinct and 

 well impressed ; posterior cicatrices distinct ; dorsal cicatrices placed under the plate 

 within the cavity of the beaks and deeply impressed ; cavity of the shell rather 

 deep and rounded ; cavity of the beaks rather shallow and rounded; nacre either 

 white or salmon color and iridescent. 



Soft Parts. — Branchial uterus not charged, but ova were found in the ovarium. 

 Branchiae very large, quite semicircular, inner one a little the larger, free two-thirds 

 the length of the abdominal sack. Palpi large, pendant, suboval, united nearly half 

 way down the posterior edges. Mantle thin, slightly thickened on the posterior 

 border. Branchial opening small, with small brownish papillae. Anal opening rather 

 large, with numerous small, brownish papillae on the inner edges. Super-anal 

 opening rather small, colored on the inner edges, united below. Color of the mass 

 whitish. 



Remarks. — Two specimens only were received by me. That which is figured is the 

 more imperfect of the two. The better one was received from Dr. Neisler after the 

 drawing was made. In both, the points of the beaks for some distance are worn 

 square off, so that the character of this portion cannot be given. It is evident they 

 were high and massive. The specimen from Dr. Neisler has a rich salmon colored 

 nacre, quite satin-like ; that from Mr. Plant is white, with a slight disposition to a 

 salmon tint near the margin. It is near to Hanleyanus (nobis) in outline, but is 

 rather more triangular, has a higher and more angular umbonial slope, has a black 

 and polished epidermis, and is without colored spots or bands. 



Unio Plantii. PL 21, fig. 76. 



Testa lsevi, regulariter elliptica, valde compressa., inequilaterali ; valvulis subcrassis, antic.e crassioribus ; 

 natibus prorninulis ; epidermide tenebroso-castanea, micante, eradiata ; dentibus cardinalibus parvi- 

 usculis, subdepressis, obtuso-conicis crenulatisque ; lateralibus prselongis, subcrassis curvisque ; mar- 

 garita salmonis colore tincta et valde iridescente. 



Shell smooth, regularly elliptical, very much compressed, inequilateral; valves 



