MACHO POIHD.K. 
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beneath ; the fourth toe much developed, and armed with a 
large solid claw* compressed above, broad and lint beneath* 
and more or less pointed ; the fifth, or outer toe, well deve¬ 
loped, but shorter and smaller thnn the enormous fourth 
toe, like which it is armed with a strong solid claw: fibula 
slender, and with its lower half closely applied to the tibia* 
though easily separable, excepting in Ht/ptiprymnus, where 
the lower portion is firmly joined to the tibia. 
Tail long, and usually very powerful. 
Pouch well developed, and Opening forwards. 
Mam tact four 1 . 
Stomach complex; coccum long and simple. 
Thf. incisor teeth of the upper jaw present a broad outer 
and inner surface* and are compressed from front to back; 
uud so far resemble the incisors in man. The two foremost, 
thongh rather widely separated at the base, converge and 
meet at their apices: they are considerably arched in front 
in the longitudinal direction, and have the outer surface 
slightly convex in the transverse direction, and often present¬ 
ing a shallow longitudinal depression. The second incisor is 
usually narrower than the first, dilated at the extremity, which 
is truncated, nearly Hat externally, or slightly convex, and 
sometimes presents a vertical groove at this part; the third 
incisor is most frequently broader than either of the preceding 
pair, and has one or two external vertical folds; its apical 
portion is partly overlapped in front by the second incisor; the 
apices of these teeth are on the same plane, or nearly so, but the 
cutting edge of the foremost, on each side, descends obliquely 
from the outer to the inner side. The lower incisors are 
horizontal, long, compressed, and lanceolate, and have cutting 
external and internal margins; their outer surface is convex, 
and the inner surface is strongly convex in the transverse 
direction, in the middle, but concave near the margins; when 
1 I am not sure that this number of mamma? is constant. 
