TO GEOLOGY. 173 



F.parva. Plate 6. Fig. 181. 



Description. Shell subfusiform, transversely striate be- 

 low, longitudinally and rather widely ribbed, with small 

 spines on the angle of the whorls ; substance of the shell 

 thin ; spire rather elevated ; suture irregularly impressed ; 

 whorls six, angular and subcanaliculate above ; mouth 

 narrow, straight ; columella somewhat oblique, with three 

 folds ; outer lip sharp. 

 Length 5-20ths, Breadth 3-20ths, of an inch. 



Observations. This is a smaller species than the last, 

 and may be distinguished by its more tapering spire, its 

 wider ribs and spines, which are, however, small. A 

 single specimen only of this and the last described species 

 having come into my possession, it may be found, in others, 

 that the characters mentioned above are not entirely per- 

 manent. 



V. Fanuxemi.* Plate 6. Fig. 182. 



Description. Shell turbinate, transversely striate on the 

 base, with rather large spines above ; substance of the 

 shell thick ; spire short ; suture small ; whorls five, angu- 

 lar above ; mouth somewhat narrow ; columeUa with two 

 folds ; outer lip sharp. 



Length 1.2, Breadth .7, of an inch. 



* I have placed on this species the name of my friend, Professor Van- 

 uxem, one of our most distinguished geologists. 



