109. -Jaw of Thylacotheiium. 



107.— Soullet ipecimen of young Omithorhynchut 



103.— Portion of integomtnt Irom the Alidomen of Omithorhynchui. 



Front View of Muidibles of the above 



IM.— Mammary Gland nf Omithorhynchoa, reduced below the 

 natural aiz^. 



110.— Jaw of Ph^urolotherinin 



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