“Tree-Ducks” of the genus Dendrocygna. 67 
Very slightly enlarged. From skeleton No. 15272, Coll. U. S. Nation. 
Mus. Anconal aspect. Extreme length 72 mm. 
The bones figured in this Plate are of a specimen of the Old- 
squaw Duck (Harelda hyemalis). Adult (No. 18627, Coll. U. S. Nation. 
Mus.). They are somewhat reduced; the extreme length of the humerus 
in Fig. 65 being 76 mm. 
Fig. 63. Left coracoid and scapula; oblique anterior view, 
Fig. 64. Right lateral aspect of the sternum, with costal ribs 
of that side, all to the first one, 
Fig. 65. Left humerus, anconal aspect. 
Fig. 66. Left lateral view of the skull and mandible, 
Fig. 67. The os furcula seen upon right lateral aspect. The 
left clavicle shows beyond, — its mesial surface. 
Fig. 68. Dorsal view of parts of the trunk skeleton, with the 
bones seen normally articulated. The right pubic element is broken 
off. Five dorsal vertebrae are in position with their vertebral 
ribs. There are also two pairs of sacral ribs. This pelvis is very 
delicately constructed, and the postacetabular sacral vertebrae remark- 
ably individualized. 
Plate 10. 
The bones of Chenonetta jubata figured in this Plate are of a specimen 
in the Collections of the U. S. Nation. Mus., No. 19213. They are prob- 
ably subfossil, having been found in a cave, and they came from Otago, 
N. Zealand. Adult. Natural size. The bones shown in Figs. 69 and 
76 are broken and imperfect. 
Fig. 69. Dorsal view of pelvis. 
Fig. 70. Dorsal view of left scapula. Note the absence of the 
pneumatic foramen at its anterior extremity. 
Fig. 71: Right carpo-metacarpus; palmar aspect. 
Fig. 72. Left tarso-metatarsus; anterior surface. 
Fig. 73. Left femur; anterior surface. 
Fig. 74. Left coracoid; seen from in front. 
Fig. 75. The os furcula; direct anterior view, exhibiting the 
marked circularity of the arch. 
Fig. 76. The skull from above. Superior mandible broken off 
and only partially in position. Zygomas gone and mandible removed. 
This figure, however, gives the general form of the skull on its superior 
aspect. 
Fig. 77. The right humerus; anconal aspect. 
Fig. 78. Direct ventral view of the sternum. 
Fig. 79. Dorsal aspect of the pelvis and attached ribs of the 
Canada Goose (Branta canadensis). Adult. Much reduced (No. 17980, 
5* 
