154 
MR. WATERHOUSE ON A NEW GENUS, ETC. 
by the comparatively sudden transitions from one form to another which we find in the 
Marsupialia, which group, we must also bear in mind, stands low in the grade of or- 
ganization among Mammalia. 
Fig. 1. 
Plate XXVII. 
Myrmecobius fasciatus. 
Plate XXVIII. 
Cranium of Myrmecobius fasciatus seen from above. 
Cranium seen laterally. 
Palate and teeth of upper jaw. 
a. Posterior molar of upper jaw magnified. 
b, c, d, and e. The four preceding molars magnified. 
Teeth of the upper jaw magnified. 
Teeth of the lower jaw magnified. 
a. Last molar but two seen from above. 
Half the lower jaw seen from above, with the teeth as seen in first specimen. 
Side view of the same. 
Under side of left fore foot. 
a. Side view of claw of fourth toe. 
Under side of right hind foot. 
a. Claw of the inner toe. 
EE a 
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