{96 MAMMALIA, 
very often rudimentary. In both orders the tail varies from an extraordinary length, 
as in the squirrel and pheasant, to being very short, as in the hare and partridge. 
No orders in their respective classes present the tail so spread out and flattened as 
the Glires and Rasores—witness the beaver and peacock. In both orders the sense 
of hearing is much developed. In both orders we find animals, such as squirrels 
and pigeons, with their toes perfectly free; and others, as Hydromys and Phasianus, 
which have them united at the base by a membrane. Castor is an aquatie animal, 
having some relation to Cetacea; Struthio is a terrestrial animal, approaching to 
Notatores. And so on, relation comes so fast upon relation, that I know not how 
we ean for a moment hesitate to place the Glires opposite to the Rasores. 
“TI conceive it now to be demonstrated, that, so far as relates to the analogies ex- 
isting in nature between the orders of Mammalia and Aves, we ought to place them 
thus :— 
Animals typically. 
lee INE RA a ots: 0 feistoje! «aie CALDIVOLOUS 2% ojo alo.fa\aieinhejolaiors)- (eminence at STORRS s 
Ze PP RIUMGATIES)« oisecles o OMNI OLOUS sa) cic, «2.10 ae sides lets cies ele.) LNISES SOREN: 
pal Ging Senok SRC EHS OI Imo uaee@osin HB dito tEite.< . 3. RASORES. 
4. UNGULATA ...... frequenting the vicinity of water .... 4. GRALLATORES. 
Je CETACEA. ‘ao. 5 se «71 AQUAUC sisvelese cisle caiee eclolels seria ricisie =O sm DOMES 
