95 
GRADATION AMONG ANIMALS. 
TERTIARY. 
SECONDARY. 
PrimaRy. 
Present, oo+ +0 
Pliocene, «+ ++. 
Miocene, «eos 
Eocene,-++cee 
Cretaceous, 
JUTASSIC,e++ 206 
TYiassic, eee eee 
Permian, «+++ 
‘ Carboniferous, 
Devonian, +++. 
RADIATES. 
derms. 
eseeeetcolieeceeeeoeee 
eecoereeealee2e0ee0080380 
eeeeaeoe e@e2e00080000 
MOLLUSKS. ARTICULATES, 
ee ETE (Fr re EE, ed name (Frm oe — 
Polyps. Acalephs. Echino- A gephala, Gastero- Cephalo- worms, Crustacea. Insects. Fishes. Reptiles. Birds. Mammalia. 
poda. poda. 
eeoeeenBlieoveese es eceoeeeees|eeeeeee 
@GCCOGe| CHOHeeseieeeee000)/9¢8000808 
eeeeseeleeeeeee|seeeeseeeieeeen ee 
@eeeseeeieeeoeeee 
eocee Insects.ceee e 
VERTEBRATES. 
eeeeoae 
e@eeeed 
eceees| True Mammalia. 
@eeecel|e eee Marsupials... e 
ceo cBirdS.ccocccccoecccece 
oo oReptiles.sce.-cesccccccccccce 
Silurian,...Polyps. Aoalephs. Echino- Acephala. Gastero- Cephalo- Worme. Crustacetcs «occ ce oe KiSNGB.:10 00 ccc cecec cee see 0 eeeeose 
Awic. 
derma, 
poda.  poda. 
