350 BULLETIN UNITED STATES GEOLOGICAL SURVEY. fVoZ.FL 



PLATE XI. 



Fig. 78. — Sacral vertebral rib with its bsBmapopbysis, left side ; tv', the pleurapophy- 

 sis, posterior view ; w, the corresponding bsemapopbysis. 



Fig. 79. — Fifth pleurapopbysis witb its corresponding hsemapopbysis attached; 

 from the same bird, dorsal vertebrse, inside view. 



Fig. 80. — Fourth pleurapophysis with its corresponding haemapophysis attached ; 

 from the same bird, ( Cupidonia), dorsal vertebrfe, outside view. 



Fig. 81. — Sternum from below ; same bird. 



Fig. 82. — Sternum, left lateral view ; same bird {Cupidonia cupido). 



PLATE XIL 



Fig. 83. — Pelvis from above ; same bird. 

 Fig. 84. — Pelvis, right lateral aspect ; same bird. 

 Fig. 85. — Right scapula and coracoid, in situ ; same bird. 



Fig. 8C. — Left coracoid, posterior view, from the scapular arch of the same bird. 

 Fig. 87. — Right lateral view of clavicles, from the scapular arch of the same bird ; 

 dotted lines show the outline viewing it from behind. 



PLATE XIII. 



Fig. 88. — Right lateral view of skull of adult $ Lagopus leucurus ; hyoid arch has 

 been removed. 



Fig. 89. — Cvaninm of Pedioecetes plla8^anell^l^ ; lacrymal, nasal and intermaxillary still 

 attached. 



Fig. 90. — Pelvis, adult ,$ Tetrao canadensis, viewed from above. 



Fig. 91. — Portion of skeleton of Ptarmigan, Lagopus leucurus, showing thoracic and 

 pelvic bones in situ, with the scapular arch and caudal vertebrae. The last cervical 

 vertebra still remains attached in order to show its free pleurapophysis. 



