350 BULLETIN UNITED STATES GEOLOGICAL SURVEY. \Yol.Yl. 



PLATE XI. 



Fig. 78. — Sacral vertebral rib with its hremapopbysis, left side ; w', tbe pleurapophy- 

 sis, posterior view ; w, tbe correspouding bjemapopbysis. 



Fig. 79. — Fiftb pleiirapopbysis witb its corresponding baemapopbysis attacbed; 

 from tbe same bird, dorsal vertebrre, inside view. 



Fig. 80. — Fourth pleurapophysis witb its corresponding hsemapopbysis attacbed ; 

 from tbe same bird, ( Cupidonia), dorsal vertebra?, outside view. 



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



FiG. 82. — Sternum, left lateral view ; same bird {Cupidonia cu,pido). 



PLATE XII. 



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. 80. — Left coracoid, posterior view, from the scapular arch of tbe same bird. 

 Fig. 87. — Right lateral view of clavicles, from tbe 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 S Lagopus leucurus ; hyoid arch has 

 been removed. 



Fig. 89. — Cranium of Pedioecetes phasianellus ; 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 vertebrte. Tbe last cex'vical 

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



