228 Annals of the Carnegie Museum. 



The free firs/ juetatarsal is articulated in the usual manner. Its facet 

 on the metatarsas is elongated, being on the lateral edge of the shaft 

 about a centimeter above the internal trochlea. As to the accessory 

 metatarsal itself, it is somewhat twisted ; expanded proximally ; and 

 bears distally the usual trochlea for articulation with basal joint of 

 hallux. The joints of pes are upon the normal arrangement, that is, 

 2, 3, 4, 5 for first, second, third and fourth toes respectively. They 

 are proportioned, present nothing peculiar, and their principal meas- 

 urements have been given above. 



The terminal or ungual joints are rather short, inclined to be weak, 

 are pointed distally, and show scarcely any curvature, — really none at 

 all, — in the antero-posterior direction. This also applies to the inter- 

 mediate phalanges between them and the trochleae of the tarso-meta- 

 tarsus. 



On the Sternum and ShonlJer-i^inile of Mycteria : Taken in their 

 main characters, these parts of the skeleton in the Amazotiian Adjutant 

 (Spec. 1 1 51 1, S. I. coll.) agree more or less with the corresponding 

 ones as we have described them above for Tanta/ns. There are a 

 number of important differences however, as, for example, the cora- 

 coids in Mxcteria do not discussate in their sternal beds, but are sep- 

 arated by an interval of several millimeters of bone. Mycteria again, 

 has but four hsemopophysial facets upon either costal border of the 

 sternum, and the latter bone is relatively shorter and more massive. 

 In front, the manubrium is entirely aborted, while posteriorly it is 2- 

 notched in a manner c[uite similar to what was found in Tantalus. It 

 is highly pneumatic, its thoracic surface very deeply concaved, being 

 actually riddled with various air-holes. Peculiar transverse and irreg- 

 ular corrugations occur upon the same aspect, the pneumatic foramina 

 occurring in the intervals between them. The carina is of great depth, 

 and somewhat swollen in its anterior moiety by a pneumatic cavity. 

 The upper half of the anterior carinal border presents a deep longitu- 

 dinal excavation, at either basal end of which exist pneumatic foramina 

 leading into the carinal swelling mentioned in the last paragraph. 

 Strong muscular lines mark the sides of the keel, and the ventral aspect 

 of the body of the sternum. The several bones of the pectoral arch 

 resemble those of Tantalus in general form. They are also pneumatic. 

 Os furcula however, is more of a decided U-pattern, though its sym- 

 ])hysis below makes the same articulation with the carinal angle of the 

 .sternum, as occurs in Tantalus. The apices of the free clavicular 



