INCUBATORIUM OF ECHIDNA 5 



of the abdomen from that of Echidna, 

 In the case of Echidna, the cutaneous muscle, 

 which covers nearly the whole surface of 



Fig. 1. — Echidna: Ventral View of a Brooding 

 Female, showing the so-called Incubatorium 



SOMEWHAT ENLARGED. (HaAGKE.) 



-r-!- The two tufts of hair in the lateral folds of the mammary pouch 

 (6.771.), from which the secretion flows ; cl., cloaca. 



the trunk, leaves free an oval area of the 

 abdominal wall, situated between the two 

 mammary glands. This area can accordingly 



