. Contributions to the anatomy of birds . ual fibularfissure; behind, the popliteal depression is well sunken, one of the mus-cular lines running into it, and often a foramen is found at its fossae are found laterally at the outer surfaces of the condylarenlargements, and some-times a notch where shaftmeets the internal one ante-riorly. The bone is usuallyslenderer in Bonasa, Pedi-cecetes, and Canace canaden-sis. Among the Ortygince thefemur has the same generalcharacteristics; it is, how-ever, non-pneumatic, thedouble pit for the ligamen-tum teres is better marked,and the muscula
. Contributions to the anatomy of birds . ual fibularfissure; behind, the popliteal depression is well sunken, one of the mus-cular lines running into it, and often a foramen is found at its fossae are found laterally at the outer surfaces of the condylarenlargements, and some-times a notch where shaftmeets the internal one ante-riorly. The bone is usuallyslenderer in Bonasa, Pedi-cecetes, and Canace canaden-sis. Among the Ortygince thefemur has the same generalcharacteristics; it is, how-ever, non-pneumatic, thedouble pit for the ligamen-tum teres is better marked,and the muscular lines arescarcely perceptible. The patella is never absentin the Tetraonidce, and occu-pies itS USUal position as a Orortyxpieta. free bonelet protecting the anterior aspect of the knee-joint. It accom-modates itself to the conformation of the rotular channel, having a flat-tened surface superiorly, a below, and a double surfacebehind, the most extensive aspect of which is applied to the side towardsthe internal 696 GEOLOGICAL SURVEY OF THE TERRITORIES. The proximal extremity of tibia in the young chick of Centrocercushasadvanced so little towards assuming any of the definite characteristicsof the full-grown bird, that, almost in self defense, we take up for exam-ination the bone from a skeleton of a bird of the same species severalweeks older: here we discover the superior general condylar surfacestill capped with cartilage, and the borders confining it, as yet, butfeebly produced. The most interesting point, by far, is the appearanceof an unusually large epiphysis, if it may be so termed, fashioned toand resting upon the future location of the rotular crest. Why this bone should be here added we cannot, as far as our knowl-edge extends, exactly comprehend, for in the old and mature birds ofany of the Grouse the epi-cnemial crest is never very prominently pro-duced, nor is it in any of their near kin. As age advances this seg-ment becomes thoroughly
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectbirds, bookyear1882
