ADANSON. 



excellent work in France on this snbject*, which was repub- 

 lished in 1780, with considerable additions and improvements, 

 by Messrs. Favanne ; there are upwards of 2000 shells figured 

 in this edition, in a manner much superior to that of any 

 which had been published before. In 1757 M. Adanson pub- 

 lished his Histoire Naturelle du Senegal-f, in which he has 

 figured about 1 85 species, and accurately described not only 

 the shells, but also most of the animals contained in them ; 

 these are arranged according to a system of his own invention, 

 taken principally from the structure of the animals. Under 

 most of his species he has placed many varieties that most 

 authors have considered as distinct species ; he has been very 

 particular and minute in his descriptions of the animals, as 

 well as their shells, and has divided them into 30 genera, in 

 four divisions, as follow : 



* Linn. Trans, vol. 7. p. lea. + Ibid, p. 172. 



II 



