io6 C O N C H O L O G Y. 



rally of a middle fize, and Rumphius 

 gives them the contour of a rixdoUar, or 

 about ail inch acnofs. However, the I'pe- 

 cimens preferved in the Britifh Mufeum 

 confirm Lifter's appellation, and inform 

 lis they are to be found from the common 

 fize of an inch, and an inch and a half 

 acrofs, to above two inches and a half 

 acrofs. Thus, by the collation of united 

 obfervations, we always gain additional 

 knowledge, and therefore fuch enquiries 

 ihould be afliduoufly purfued. 



In order, therefore, to acquire fuch iU 

 luftrations of natural hiftory, it will be 

 neceffary to intreat every colleflor to keep 

 a meer catalogue, if his will or leifure 

 does not prompt him to take further 

 trouble, and only enter* the kinds, fizes, 

 and colours of his Shells, whence bought, 

 and other very remarkable particulars. A 

 parcel of fuch meer notices may be of 

 great ufe to a man of fcience, whofliould 

 happen to perufe them. 



This 



