TO GEOLOGY. 169 



suture linear ; whorls five, flattened ; mouth narrow ; 

 columella with four folds ; outer lip sharp, within striate. 



Length 3-20ths, Breadth l-20th, of an inch. 



Observations. Like the above, I have had but a single 

 specimen of this species to examine. It is, however, per- 

 fect. In outline it is very like the last described, but is 

 much smaller. It differs also in having no ribs and being 

 without the transverse line below the suture. The folds 

 are placed, like the above, near the base, and in this it re- 

 sembles two recent species described by Pyraudeau, the 

 Defrancii and Savignyi.* 



M.fusoides. Plate 6. Fig. 176. 



Description. Shell ovato-fusiform, longitudinally and 

 closely ribbed, transversely striate above, furrowed below 

 the suture ; substance of the shell rather thick ; spire 

 short, rounded at the apex ; suture irregularly impressed ; 

 whorls six, flattened ; mouth linear ; columella with four 

 somewhat distant folds ; outer lip sharp, within minutely 

 and closely crenate. 



Length ,4, Breadth .2, of an inch. 



Observations. This pretty little species differs from the 

 two above described, in being much shorter and wider in 

 proportion. It also differs in having transverse striae above 

 and having a furrow below the suture. The folds are the 

 same in number, but placed higher on the columella, and 



* Catalogue, &c, de L'isle de Corse, pi. 8, figs. 22 and 24. 

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