part 2

Cervical vertebræ 12 Dorsal ditto 6 Sacral, damaged. Caudal, damaged.

PTEROTOCHOS ALBICOLLIS. _Kittl._ (Male.)

Trachea, tongue, œsophagus, gizzard, and liver of the same form as in _Pterotochos Tarnii_. The contents of the gizzard also did not differ.

Inches Length of intestinal canal 14½ from cæca to cloaca 2½ Length of gizzard ¾ Breadth of ditto ⅝

Only the body, after skinning, of the species, was brought home by Mr. Darwin.

The skeleton of this species does not differ in anything but admeasurements from that of _Pterotochos Tarnii_; the pelvis, however, being so much damaged in that species, that I was not able to make many notes upon it, I shall give a description of that part in the present one.

Pelvis of moderate size; the ossa pubis and ischium much expanded, and elongated posteriorly, and placed nearly perpendicular to the plane of the ilium, ischiatic foramina large; two large processes arise on the ilium on each side of the junction of the caudal vertebræ for the attachment of the levator muscles of the tail.

lines Length of pelvis 14 Breadth posteriorly 8½ anteriorly 4 Length of sternum 9½ Breadth of ditto 7 In the narrowest part 5½ Depth of keel 2½ Length of coracoids 7½ Breadth of scapula in the widest