90 
distinct class, whose situation should be between the mam- 
malia and birds ; and in this opinion I most thoroughly 
concur. It agrees with the mammalia and birds in having 
warm blood; it differs from the former class in having 
no nipples, and from the latter in wanting wings. I do not 
enumerate the other essential characters of distinction, as 
those mentioned are the most evident. The class might 
with propriety be named Monorremata, aterm applied 
to them, as an order of mammalia, by two zoologists. 
Tas. xc. ECHIDNA HISTRIX, 
Ei. nigra, spinis elongatis albido aut cinereo > danlatis. 
Myrmecophaga aculeata. Shaw, Gen. Zool. 1, 175, Pl. 54. 
Ornithorhbynchus RANA Home, Philos. Trans. an. 1802, 
p- 348. 
Habitat in Australasia. 
PORCUPINE ECHIDNA. 
Black, the spines elongate, annulated, with white or cine- 
reous. we 
Inhabits New Holland. WS 
Sir Everard Home has given an account of the general 
anatomical structure of this animal, in the Philosophica! 
Transactions ie 1802, AYE AL 
