416 Annals of the Carnegie Museum. 



cjuite extensive excavation upon it, for the round ligament. A broad 

 articular surface is found at the summit of the bone for the anti- 

 trochanter of the pelvis, and the suppressed trochanterian ridge does 

 not rise above this. 



The shaft of the bone is but little bent in any direction, and it has 

 the usual cylindrical form. At the distal extremity the condyles are 

 fairly well developed, not strikingly large, the outer one being the 

 lower when the bone is held in the vertical position. In front the 

 rotular channel does not extend u]:)on the shaft above them, while 

 behind the popliteal depression is shallow also. 



The cleft for the fibular head marks the posterior aspect of the 

 external condyle, dividing it, as usual, into two parts. 



Our subject possesses a small patella of a subcordate form, maintam- 

 ing its usual relations with the bones of the leg and thigh. 



The tihio-tarsus has its cnemial crest but very slightly produced above 

 the articulating surface at the summit of the bone, while below it the 

 pro- and ectocnemial ridges are but feebly manifested, and very soon 

 merge into the shaft. I'his latter is quite straight and smooth, being 

 slightly compressed in the antero-posterior direction. At the distal 

 extremity the inner condylar protuberance is decidedly the more promi- 

 niinent, both upon the front and rear aspects. The valley between 

 these two eminences is quite wide and well defined, even to the pos- 

 terior side of the bone. 



The osseous bridge for the extensor tendons is present. 



Marked feebleness in development is displayed on the i)art of the 

 fibula of the Carolina Parrot, for this bone is found not to extend 

 below the ridge it articulates with on the side of the shaft of the tibio- 

 tarsus. Below this point the inferior apex of the fibular shaft is pro- 

 duced and replaced by a ligament of hair-like dimensions. In Cocka- 

 toos, too, the fibula is a very short bone. What there is of the bone 

 in Co/iunis, however, is fully as well developed as we usually find it in 

 the class; simply its apparently useless prolongation, as seen in many 

 birds, has never ossified. 



In the skeleton of the foot we find a short thick -set tarsometatarsus, 

 with spreading trochlear extremity. Its shaft is short and straight, 

 being much compressed from before backwards. On the anterior 

 aspect it is convex from side to side, while behind it is longitudinally 

 excavated. The hypotarsus is a narrow, projecting ledge with one 

 vertical, cylindrical perforation near its center, and scarcely grooved 



