﻿484 s^•Ml'^v^'OTA 



Symphvnota chaulottknsis (Lea). 



Shell long rhomboid, somewhat inequilateral, subsolid, con- 

 vex ; beaks slightly raisetl above the dorsal line, not intiated, 

 their sculpture consisting of doubly-looped, subnodulous ridges, 

 the anterior loop rounded, the posterior short and angular; 

 post-dorsal region raised almost into a low wing, angular above, 

 subtruncate behind; posterior ridge full, sometimes double, 

 ending behind below the median line, usually in a feeble bian- 

 gulation ; basal line ». little curved or straight ; anterior end 

 rounded and narrowed ; surface concentrically striate ; epider- 

 mis bottle-green to brown-green, sometimes clouded and band- 

 ed or feebly rayed ; left valve with a compressed, uneven tooth 

 under the beak that, when well developed, is reflexed and in- 

 clined to be A-shaped, with another low tooth in front ; right 

 valve with a comi|)ressed pseudocardinal ; two laterals in the 

 left valve and one in the right ; they are sometimes blurred ; 

 nacre flesh or straw-color, often dirty purplish in the cavities. 



Length 1 14, height 67, diam. 35 mm. 



Type locality, Charlotte, Mecklinburg Co., X. C. 

 Unio charlottensis Lea, Pr. Ac. N. Sci. Phila., VH, 1863, p. 



191 ; Jl. Ac. N. Sci. Phila., \'T, t866, p. 8, pi. ir. fig. 5 ; Obs.. 



XL 1867, p. 12, pi. ir, fig. 5. 

 Mari^aron (Unio) charlottensis Lea, Syn., 1870, p. 51. 

 Symphynota charlottensis Simpsox, Syn.. 1900, p. 663. 



Most nearly allied to S. compressa, but it is darker colored, 

 a little more inflated, has difi"erent beak sculpture and nacre. 



SvMi'HViN'OTA viKiDis (Courad). 



Shell subrhomboid, subsolid or rather thin, suhcompressed 

 or convex, inequilateral; beak sculpture of irregular, corru- 

 gated ridges, which are subnodulous and inclined to fall into 

 two loops, with a few radial threads behind: posterior ridge 

 low, very slightly double, ending behind near the base in a 

 scarcelv perceptible biangulation ; base line generally a little 

 curved, often full behind the middle; post-dorsal slope sub- 

 truncated; surface with irregular growth lines; epidermis yel- 

 lowish or lirownish-green. often feebly rayed, sometimes sub- 



