SECTION XL 243 



Thefent (RimaJ is the opening of the 

 Shells on the flopes. 



The cartilage (G7r//7^^o) joins the valves 

 together at the furrow and at the flopes. 



12. f he flat (planittes^ latus complana* 

 turn) is that fide of thofe Shells that is 

 flat ; as the flats of the Heart Cocklesj 

 Bears Paws, &c. PI. VL fig. 5> 8, and 12. 

 PI. VII. fig. 4 and 10. 



I fliall here repeat the obfervatlon made 

 at the end of the Univalves, which is, 

 that the fpecies of Bivalves are very few 

 when compared to the immenfe numbers of 

 fpecies of Univalves ; nor are they com- 

 parable to them for beauty : and, further, 

 that there are no land Bivalves, and few 

 of frefli water ; whereas the fpecies of Land 

 Univalves are extremely numerous, and 

 many kinds alfo occur in frefh waters. 



Now to my method or fyjPcem. 



R 2 SECTION 



