m the Classification of Birds, 
(a4 . . . 
“Among the Passeres a slight, but easily recognizable 
difference in the manner of insertion of the muscle main- 
Fig. 4. Right three-quartering view of the pelvis of a specimen of the Pinon Jay 
(Cyanocephalus cyanocephalus) showing the origin of the obturator intarnus muscle of 
. the right side, 0.4. Drawn by the author from the specimen, and somewhat enlarged. 
Fig. 5 Axillary muscles of the side of Gallinuwla chloropus. By}the author after 
Garrod. Exp. See., expansor secundariorum ; Pect. 1, great pecto:al muscle; B. slip, 
biceps slip; Bi, biceps; 7. triceps; and other letters as in former figures. 
Fig. 6. Outer aspect of the axillary muscles of the right arm in a specimen of the 
Mourning Dove (Zenaidura macroura). From the specimen by the author, and after 
his own dissections. Letters as before. 
tains. The similarly single cylindroid tendon runs from 
the muscular belly, which has its origin at the shoulder, as 
