166 CONTRIBUTIONS 
divided the Nassw from the Buccina generically, 1 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 Terebra, where it 
very properly may form a link with the Mitre. 
T. costata. Plate 5. Fig. 172. 
Description. Shell subulate, with low wide longitudi- 
nal ribs cut by sharp transverse striz ; 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 11-20ths, Breadth 3-20ths, of an inch. 
ee a 
