166 CONTRIBUTIONS 



divided the Nassw from the Buccina genetically, 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. gradlis. 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. 



