320 Annals of the Carnegie Museum. 



deepens a little again l)ehind. Above this intercondyloid concavity 

 in front we meet with a distinct projecting abutment, supporting a 

 small subcircular facette upon its lower aspect. This projection pre- 

 vents the bending of the tarso-metatarsus upon the tibio-tarsus beyond 

 a certain angle. This angle is about ecjual to a right angle, and when 

 the two bones mentioned are brought to that position, being at the 

 same time normally articulated, the mid-anterior process on the summit 

 of the tarso-metatarsus comes in contact with the aforesaid facetted 

 projection, and a further bending in that direction is prevented. To 

 the inner side of this projection, we find the usual osseous bridge 

 spanning the tendinal canal. The span is broad and thick, and the 

 tendinal passage created by it of no very great calibre. 



The fibula is perfectly free from the tibio-tarsus, measuring in 

 length but a little more than one-third of that bone. As is so com- 

 monly the case among birds, it simply makes articulation with it along 

 the fibular ridge, being held in its position during life by means of a 

 ligamentous attachment. Its proximal moiety is stout and rather 

 bulky, especially its head, from which latter part it tapers gradually to 

 its free distal end ; its lower third being markedly slender and of small 

 calibre. The summit of the fibula is moderately compressed from 

 side to side, and rather elongate in the opposite direction, thus giving 

 to its articular surface on top an oblong outline. At the outer side 

 of its shaft a well-marked pit with raised margins indicates the point 

 of insertion of the biceps muscle. It is nearly opposite the middle of 

 the long, narrow articular line found on the inner border of the 

 bone, intended for articulation with the fibular crest of the tibio- 

 tarsus. 



Both in Beniicla and Plegadis the lower end of the fibula fuses 

 with the shaft of the tibia ; more particularly is this the case in the 

 latter genus, than in the Goose, where the fusion is less firm. And 

 this leads me to say that I see more points of resemblance, in other 

 ways, however, between the bones of the leg of the Flamingo 

 and Plegadis guaraiina, than I do between the former and Beniicla 

 canadensis. The projecting apophysis with its facet, which occurs an- 

 teriorly above the intercondyloid fossa of the tibio-tarsus, described 

 above for Phcenicopterus is present in the Ibis but entirely absent in 

 the Goose. 



The tarso-metatarsus of P. ruber lacks but a little (2.2 cm.) of 

 being as long as the tibio-tarsus. For the most part its shaft is nearly 



