ON FOSSILS FROM NEW ZEALAND 163 
total length; 14 inch in depth, from before backwards, at its distal 
end; about 2 inches in extreme width at its proximal end. In the 
middle of its length it measures 14 inch in width, and 12 inch in depth. 
The middle of the shaft is therefore a good deal compressed from 
side to side; but its preponderating depth arises, in great measure, 
from a thick protuberant ridge which occupies the two upper thirds of 
the outer half of its anterior face (fig. 3). Superiorly, this ridge is 
bounded by a wide transverse groove, which marks the great tuber- 
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\y ; IP 
Ely HP 
Fig. 3.—dAuterior face of the left humerus of Fig. 4.—Ziner face of the same bone 
Phoceenopsis Mantellii. Nat. size. (fig. 3). Nat. size. 
osity of the humerus in front, and is continued downwards upon the 
inner side of the ridge, terminating, above its inferior end, in a sort 
of cul-de-sac. Inferiorly, the ridge ends in a roughened oval pro- 
tuberance, which occupies the lower of the two median fourths of the 
longitudinal diameter of the bone ; and, as this tuberosity is abruptly 
truncated below, the lower fourth of the bone is considerably nar- 
rower than its middle part, when viewed laterally. 
The posterior face of the humerus is slightly concave, very wide 
(19 inch) above, where it spreads out into the articular head on the 
inner side and the tuberosity on the outer, but narrowing below to 
NE 2 
