94 



by a long narrow space, and situate at the termination of the pos- 

 terior third of the length of the hinge margin ; extremities of the 

 hinge margin angulated ', anterior edge, superior moiety recti- 

 linear ; posterior edge rounded ; inferior edge nearly rectilinear, or 

 very obtusely rounded ; on the hinge space one or two angulated 

 lines are drawn from the apex, diverging to the hinge edge. 



Length less than seven-twentieths of an inch. Breadth one 

 inch and one-fifth. Inhabits the coast of the United States. Cabi- 

 net of the Academy and Philadelphia Museum. 



This species which is abundant in some districts, is remarkable 

 by its transverse form, and may be known among the foregoing 

 species, by the apex being situate opposite to one-third of the dis- 

 tance from the posterior termination of the hinge margin. 



NucuLA PROXIMA. — Shell sub triangular, oblique, concentrical- 

 ly wrinkled, and longitudinally marked with numerous, hardly 

 perceptible striae ; posterior margin very short and very obtusely 

 rounded, a submarginal impressed line ; anterior margin very ob- 

 lique, and but slightly arquatcd ; umbo placed far back ; within 

 perlaceoiLS, polished, edge strongly crenated ; teeth of the hinge 

 robust, the posterior series very distinct and regular. 



Greatest length, parallel with the posterior margin, three-tenths 

 of an inch. Breadth less than two-fifths of an inch. Inhabits 

 the Southera coast. Cabinet of the Academy. 



Very much resembles TV. nucleus, but is proportionally wider, 

 and the posterior series of teeth is more regular and distinct. It 

 may possibly prove to be only a variety, when numerous specimens 

 are carefully examined and compared. 



Venus notata. — Shell obtusely rounded before, and with a 

 slight undulation on the anterior margin ; disk nearly destitute of 

 the elevated concentric striae which mark the borders of the shell, 

 and distinguished by rufous zigzag transverse lines ; within yellow- 

 ish-white. 



Breadth about three inches. Inhabits the coast of the United 

 States. Cabinet of the Academy and Philadelphia Museum, and 

 Mr. Wm. Hyde's collection. 



A rare species, called the lettered clam. I obtained one speci- 

 men at Great Egg Harbor, and another on the coast of Georgia. 

 Mr. Hyde received his specimen from New England ; it has the 



