12 ANNALS OF THE QUEENSLAND MUSEUM, No. 6 
bone, in which the entepicondyle is prolonged distad so far as to 
give to the distal contour of the bone an approximate squareness, 
which is altogether wanting in the fossil. The radial tubercle 
(trochlea radialis) (c) is comparatively small in the extinct bird, 
and the m. probrachialis impression is much deeper. A tubercle 
for the insertion of ligament (Fig. A a) rises proximad of the entepi- 
condyle in P. lacustris, in the living bird the insertion is into an 
oval depression on the unraised surface of the bone. In size 
these bones do not exceed the dimensions of large examples of 
C. atrata. Localities, Lower Cooper and Kalamurina. 
Radius. — Proximal fourth of a right radius (Plate III., fig 3). 
This has all the distinctive marks of a swan's radius, which can 
hardly be mistaken for that of any other bird of similar size. It is 
clearly not that of C. atrata. Its shaft is equally strong, but its 
articulating cup (Fig. 3B) is smaller. The shaft also differs in 
form, being more distinctly trihedral. Locality, Wankamaminna. 
Ulna.— Plate III., fig. 4.— Distal third of a right ulna. This, 
in its present abraided condition, is scarcely distinguishable from 
that of C. atrata, and suggests nothing worthy of record. 
Femur. — Plate III., fig. 5.— The proximal three-fourths of a 
right femur recognizable by means of its size and proportions, and 
by the presence of the small round foramen a short distance distad 
of the neck on its postaxial surface. The head and adjacent part 
are much corroded, and fail to yield any information. The shaft is 
considerably stouter than in a large C. atrata. There are remains 
of a well-developed pectineal tubercle. The linea aspera is a 
very low rugose ridge. Locality, Undwampa. 
The proximal half of a left femur of similar size has on the post- 
axial aspect the uneven surface beneath the trochanter as well 
pronounced, but of a different pattern, to that of the present swan. 
The adductor magnus limiting ridge is in this example extant. 
Locality, Lower Cooper. These leg bones indicate a heavier 
bird than the present swan. 
Tibia.— A distal half of a left tibia (Plate III., fig. 6 A b). 
The shaft is equal in breadth to that of a large C. atrata, but the 
depth across the outer condyle (Fig. B) is much less, and the two 
condyles are of the same length or very nearly so ; the bridge 
over the ext. dig. communis tendon (Fig. A b.) is much narrower. 
In other respects the bone resembles that of Chenopis. Locality, 
Malkuni. 
T arsomet at arsus.— Plate III., fig. 7 A, B. — A proximal end 
from the left foot, the same size as in a female of C. atrata. 
The ridge for the tendon Achillis is missing (Fig. 7 A a), the other 
ridges (be) separating the grooves for the deep peroneal and flexor 
profundus are better developed than in the recent swan. Part of 
the insertions of the tibialis anticus are evident in front ; the 
