8o CONCHOLOGY. 



Succeeding writers, inftead of this fub* 

 ftituted three other divifions, viz. uni- 

 valves, in which they comprehend both 

 the non- turbinated and turbinated 5 the 

 bivalves and the multivalves. 



To' this laft, which is the generally- 

 received divifion, I adhere : and I ihall 

 adopt the term Univalve now ufed, though 

 it is not very proper* My only reafon 

 for fo doing is, that cuftom has ftampt 

 an authority on it ; and I am unwilling to 

 change a term now univerfally received^ 

 to avoid confufion. 



I proceed to the firft divifion, or uni- 

 valves ; but fhall only take notice here, 

 of thofe authors who have treated Shells 

 in a methodical Or fyftematical m.anner* 

 And 



Firft, Lifter, who begins with the land 

 and frefti water univalves, in which, 

 in regard to method, not any thing re-* 



markable 



