




; resen 
j oe f the Dein There i are no ial ence 
ee complicated spiral cochlea. The young are brot eh: 
an advanced stage of development, not requiring to k 
fed by the mother. The corpus callosum is Jarge an 
- angle of the mandible is not inflexed. 
- The sub-class Monotremata includes the orders Ware ) 
~ Rodentia, Insectivora, Edentata, Chiroptera, Primates, Pinniped 
Cetacea, Sirenia, Proboscidea and Ungulata, or in other wor 
in a all the cats, dogs, bears and weasels, all the squirrels, 
rabbits, shrews and moles, ics and ant- "eaters, bats a 




rig te sh nape, © 




and dugongs, elephants and seid and all the Be and: | hors pe 
as well as all races of mankind. 
As being most highly specialized and departing most { 





class is considered the highest of the three. Medea nae 
i that the lower sub-classes were once propostonniy more 
_-——s merous, especially the marsupials. , 

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