329 



gin regularly rounded, anterior (pof:t€rior) margin beaked, the 

 rostrum turned to the left and slightly gaping, ligament slope 

 straight ; basal margin regularly arcuated, a little contracted near 

 the beak ; valves whitish, often tinged ^nt]l ferruginous, with small 

 concentric wrinkles and sHght waves ; witliin white, a little sculp- 

 tured by the external waves ; no lateral teeth, two cardinal in one 

 valve, and one with another hardly elevated filiform one in the 

 other. 



South coast of the United States." 



Telltn'a BEEviTEOxs 8ay, Am. Conch, t, 64. f. 1. 



Ovate, tliin, fragile, not very convex, white, tinged particularly 

 on the umbo with pale duU fulvous ; with transverse (concentric) 

 slender striae, and in a particular light obsolete longitudinal (radi- 

 ating) strise are visible; beaks much anterior (posterior) to the 

 middle, forming an angle in consequence of the anterior and pos- 

 terior hinge-margin being rectilinear to a considerable distance, the 

 latter parallel to the base ; anterior (posterior) side short and ab- 

 rupt, rounded at the tip, and with a submarginal undulation; 

 posterior (anterior) side more than as long again as the anterior 

 (posterior), rounded at tip; within much more deeply coloured 

 with fulvous ! cardinal teeth, two in the left and one in the right 

 valve ; lateral teeth none." 



The shell is represented in the drawing as nearly an inch long, 

 of a pale rose-colour (!), and of a subeUiptical contour, a shape 

 neither agreeing with the description nor with the further state- 

 ment that " its outhne corresponds with T. donacina, but is more 

 convex" (!). I regard it as a very doubtful and ill-defined species. 

 A single specimen only has been met with by Dr. Eavenel in 

 South Carolina. 



The T. lintea of Conrad, which, being described in company 

 with recent shells, I had introduced into my * Descriptive Cata- 

 logue,' I have since ascertained to be fossil. 



