MAMMALIA 



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FIG. 182. Group of Monotremata. A, Proechidna bruijnii; B, Proechidna 

 nigroaculeata; C, Echidna aculeata; ventral aspect to show brood pouch; D, 

 Echdina aculeata; E, Ornithorynchus anatinus; F, Ornithorhynchus standing up 

 like a penguin; G, Ornithorhynchus female allowing young to obtain milky 

 secretion from the diffuse abdominal mammary glands. (All redrawn, A, B, F, 

 G, after Brehm; C, after Haacke; D and E, after Vogt and Specht.) 



