, fourfold division. 79 
nme marine formations, and the English Crag; 
nar ne deposits of Sicily, Ischia, and Tuscany* 
marine foi- 
fourfold chalk, there intervenes a 
a h e I show them to have been formed In fresh 
es r of many ter- 
stnal and aquatic quadrupeds, 
he greater number of shells, both iu the 
resh-water and marine formations of the tertiary 
aerms, are so nearly allied to existing 
hat we may conclude, the animals by whth 
been endowe^lSi r^’ 
ment as the “ capacities of enjoy- 
•ent as the cognate mollnsks of living speLs 
eloJimarirtlm"™ ‘'‘»- 
-ions thJt preriiT~i:s'’‘'it“‘'‘‘^i 
he more iiuDortnni tvx • • will 
uportant to investigate the extinct 
h 3,0?6 .“o1Zh "" ““f 
and, i ’ teZer 
Til. naniarioal Zorto? of ' “ .■ihiaions. 
I'lus expressed. In the extinct species may be 
Newer Pliocene period .... 90 to 95 ' 
MioclnepLTod!"™'^ •••• 35 to 50 I Per cent, are of 
Eocene period ‘ 
Geology, 4. Ed. vol'.'ii'i. p. 308. 
