COLLECTION OF SHELLS. 5ll 



rity or the beauty of their shells. We have twenty- 

 eight species of turritella, eight of which are 

 fossil : these last are the more interesting to 

 geologists, as they partly characterize the jura 

 limestone. The genus phasianella consists of fif- 

 teen species ; one of which, the bulimoides, was 

 so scarce forty years ago, that three thousand 

 francs were given for a single specimen. The 

 naturalists who accompanied captain Baudin's 

 expedition, brought so many from Mary's Isle, 

 that it is now to be procured at a very moderate 

 price. Of the thirty-eight species of turbo which 

 we have in the cabinet, we shall only point out 

 the t. marmoratus, t. coronatus, and the t. sar- 

 maticus. Next to this genus are ninety-four spe- 

 cies of monodonta, several of which, from New 

 Holland, are ornamented with the most lively 

 colours. Next come ninety-two species of tro- 

 chus, the rarest of which are the t. Solaris, 

 the t. indicus, the t. imperialts, and the t. gra?ia- 

 tum. The last genus of this family is the sola- 

 rium ; we have fifteen species, seven of which 

 are fossil. The most singular is that known by 

 the name of perspectiviirn. 



7th. The family of the scalaria is composed 

 of the genera ddphinula, scalaria , and vermetus. 

 We have eleven species of the delphinula, three 

 of which are fossil. The scalaria preliosa is one 



