33 
characteristic of the long air-bones in birds. The portion of the distal end chiefly 
serving for muscular attachments and the antibrachial articulation are also cancellous. 
The radius (Pis. III. & XII. fig. 15) is a straight and slender bone, 3 inches 1 line in 
in length, and 2 lines in chief diameter of the shaft. The proximal articular surface is 
subcircular, 3 lines in diameter, moderately concave ; the distal end expands to the same 
extent, but is compressed, as usual. 
The ulna (Pis. III. & VIII. figs. 16 & 17) is 3 inches 1 line in length, of the usual 
ornithic character, with a well-defined, narrow, elliptic, rough muscular depression, 8 lines 
in length (fig. 16, c), extending upon the shaft from below the anterior or palmar angle 
of the proximal articular surface. This bone has no pneumatic foramen ; the orifice for 
the medullary artery is above the middle of the same palmar surface, the canal inclining 
distad. The shaft of the bone is nearly straight ; the back or anconal surface, which is 
slightly convex, shows feeble impressions of the attaching ligaments of the alar plumes, 
which are represented in all the figures of the entire or living bird. A second ulna is 3 
inches 3 lines in length. 
There was no carpal or pinion bone in the collection of remains submitted to me : this 
part of the wing is conjecturally restored in dotted outline in Plate XV. 
Bones of the Leg. (Pis. III., IX., X. & XI.) 
Of the five/mora in the above defined series of remains of the Dodo, two measure 
6 inches 3 lines in length ; one (PI. IX.) is 6 inches 4^ lines ; the shortest is a little 
under 6 inches, with proportionate differences in the diameter of the shaft. All of them 
show a small pneumatic foramen (PI. IX. figs. I & 2,p) on the inner side of the anterior 
ridge of the great trochanter (ib. c), and on the same transverse line with the head of the 
bone. This part shows an oblong depression (ib. figs. 2 & 3, «) for the “ ligamentum 
teres” at the upper and back part. The articular surface on the same aspect of the neck 
(ib. fig. 3, h), adapted to the trochanterian prominence of the pelvis (PI. VII. t), is 
well-defined. The trochanter (PI. IX. fig. 1, c) rises, ridge-like, above the level of the 
head, and is continued from behind the middle of the articular surface on the neck, 
forward, with a convex outline upon the fore and outer part of the shaft, where it gra- 
dually subsides ; a narrow intermuscular ridge (ib. fig. 1, r), inclining to the middle of 
the fore part of the shaft, is continued from the trochanterian one. The small tro- 
chanter (ib. fig. 3, d) is a small subcircular tuberosity, in some specimens a ridge, 3 to 
4 lines in length, on the inner side of the shaft, about an inch below the head. The 
muscular impressions on the fore part of the bone are well defined. A minute medul- 
lary canal (ib. fig. 3, m) perforates the middle of the back part of the shaft ; the 
popliteal fossa (ib. fig. 3, o) shows a few small pneumatic orifices ; a triangular rough 
flat surface divides the fossa from the outer condyle. Above the fibular depression 
(ib. fig. 3, g) there is a well-defined, slightly raised, rough surface (ib. Jc) for the head 
of the ectogastrocnemius muscle. The ridge (ib. n) extending to the back part of the 
F 
