ai’pk.vdix. 
margin, posterior lateral tooth distant , left valve with two widely dive’ging 
cardinal teeth, posterior one bind and very oblique; lateral teeth pro- 
foundly developed, pallia! line with a small suiur. straight or truncated. 
E. Carol/ nens /s, pi. 1, fig. 1-1. Shell oblong-ovate, slightly ventrir-ose, 
very inequilateral; mnbonal slope carinated ; posterior side elongated, 
cuneiform, contracted anterior to umbonal slope ;• cardinal margin nearly 
straight, long and oblique ; posterior end obliquely truncated, extremity 
angular : disk entire. 
A common and graceful shell, of what family remains in doubt. 
BR AC II YME R rS. Con r-ad. 
Shell equivalved, inequilateral ; hinge with two cardinal teeth and a 
deep pit between them ; anterior tooth of right valve bifid; one lateral 
tooth anteriorly and remote from the apex ; muscular impressions large, 
snhmarginai pallia! line entire, posterior tooth of left valve bifid. 
B. alia, pi. 1, tig. 18, and pi. 2, fig. 2 A Shell ovate, slightly ventri- 
cose, height rather -more than length ; posterior side short, sub truncated, 
extremity angular, umbonal slope rounded : beaks situated rather poste- 
terior to the middle of the valves. 
CRASSATELLA. Lam. 
SC'BG-ESSUS PAOirYTHJERUS. Q OUT ad. 
C. Carolinensis, pi. 2. fig. 21. Shell suboval, short, equilateral, com- 
pressed with distinct- lines of growth; posterior end truncated, nearly 
direct. 
This rare species occurs in ?Tew Jersey, where I found one valve, and 
one only at Snow Hill. 
G. vteropsis, pi. 1, fig. 25. Young shell of this species? 
ARENE. Conrad. 
Shell equivalved; hinge of right valve with two cardinal teeth, anterior 
one bifid, direct ; a large deep channel on the anterior side of the hinge, 
with a short lateral tooth at the anterior end of it. 
V. Carolinensis, pi. 2, fig. If. She'll rounded, thin in sul stance 
