166 CONTRIBUTIONS 



divided the Nassce from the Buccina generically, I am 

 unable to quote them here. 



Mr Conrad has observed in the Tertiary of Maryland 

 four species, three of which had been described by Mr Say 

 in a recent state from our shores. 



GENUS TEREBRA. Lamarck. 



T. gracilis. Plate 5. Fig. 171. 



Description. Shell fusiform, longitudinally ribbed, trans 

 versely and closely striate, substance of the shell some 

 what thick ; spire not much elevated, acute at apex ; 

 suture small, irregular ; whorls eight, slightly convex ; 

 mouth linear ; columella striate ; outer lip sharp. 

 Length .4, Breadth 3-20ths, of an inch. 



Observations. This pretty little species at first view 

 might easily be taken for a Mitra its twisted and striate 

 columella, however, place it among the Terebrw, where it 

 very properly may form a link with the Mitrce. 



T. costata. Plate 5. Fig. 172. 



Description. Shell subulate, with low wide longitudi 

 nal ribs cut by sharp transverse striae ; substance of the 

 shell rather thin ; spire elevated, acutely pointed ; suture 

 furrowed ; whorls nine, slightly convex ; mouth narrow ; 

 columella biplicate; outer lip subcrenate, within striate. 



Length ll-20ths, Breadth 3-20ths, of an inch 



