OF CONCHOLOGY. 3 



Martini in 1773 added figures of four species to those already- 

 made known, and before the century closed about seven more 

 were figured, making in all about thirty species known at the 

 close of the last century. 



The Napoleonic wars were not favorable to the progress of 

 science, and the next twenty years added but four species to the 

 list. Dillwvn's Catalogue of 1817 enumerates but eighteen spe- 

 cies, though thirty-four had been figured or named in various 

 works. Lamarck, in his Anim. sans Vert., in 1822 added five 

 more, and yet enumerates but twenty-six, Volvaria included. 



From Lamarck's time downward, the addition of new species 

 to the list has been so rapid that it would be tedious to particu- 

 larize them. About fifty-eight new ones were published from 

 1825 to 1845, inclusive ; and Sowerby, with others, added twenty- 

 nine in 1846, since which time about one hundred more have 

 been made known, making the total number of catalogued species 

 at the present time about two hundred and twenty-eight. 



The earliest fossil species known were Marg. ovulata and Vol- 

 varia buUoides, figured in Enc. Meth. in 1798. None were added 

 until the present century, and now about fifty species are known 

 which are exclusively fossil. 



208 



20 



Fossil Species. 



Miocene, 



Oligocene, 



Eocene, 



Cretaceous, 



Unknown, 



4,9 



