50 SYNOPTIC KEY 



Class MAMMALIA 



1(2) Young bom in very immature state and carried by the 

 mother in an external pouch formed by a fold of skin 

 on the abdominal surface of the body; placenta absent 

 or rudimentary. Subclass Marsupalia (Didelphia) 



One order, Polyprodonta, including opossums occurs 

 in this region. (Cory, 49.) 



2(1) Young born in relatively mature condition; never 

 carried in an abdominal pouch; placenta present and 

 well developed. 



Subclass Placentalia (Monodelphia) 3 



3(4, 5, 6) Animals with claws. Section Unguiculata, p. 50 



4(3, 5, 6) Animals with finger and toe nails. 



Section and order Primates 



5(3, 4, 6) Animals with hoofs (some more or less whalehke 

 aquatic animals excepted). Section Ungulata, p. 51 



6(3, 4, 5) Fishlike animals without posterior appendages and 

 with fore legs modified to form flippers. 



Section Cetacea 



Section UNGUICULATA 



1(2, 3, 4) Small animals with (usually) a proboscis-like tactile 

 snout and sharp pointed teeth. Dental formulas from 



in moles to in shrews. (Cory, 405.) 



0143 2013 



Order Insectivora 



2(1, 3, 4) True flying mammals with fingers of fore limbs greatly 



elongated to support a skin fold which extends also to 



2133 

 hind limbs and tail; dental formula often r^; 



the bats. Order Chiroptera 



