HKDS OF THK OREGON DESERT. 
. its lamer congener, more plastic or better 
for of »tn . , , j^g destined to pass down its kind into 
suiUHl .« the Hub«.,uent Arouse and the like, we have, in the 
futurity. For offer towards the solution of such, 
lnl;ivr,i’nI.'M ".Lin .he- -ml, camptolnimic problems. No .loubt m»ny biris 
!'muL Silver Lake Keginn of Oregon during the Phoeeue, the fos.,1 remama 
Ifthic «. ,et not iKa-n dteovered. Fifty apec.ea are e„u...erated or 
.Lril-.l in the |m-,.-i,t .ne.noir, and tl.i. tvould md.cate that the avifaima of the 
mriia, wa. far rieber in forma then than it is at the present day. Changes m 
climaU., t«i-»Kn.i.l.y,-aiul secoinlarily, changes in vegetation, have no doubt con- 
iribiiUtl to the pnHluctioii of such a result. 
KXTLANATION OF PLATES. 
(All Umj in llie I’Uun were drawn by the author from the speciraen.s, and are of natural 
in each cawj. 
1*I,ATK XV. 
I>irert mmial a»|iecl of left coracoid of Lirto* robnthis. (Cope collection). 
tHrecf anterior ajiiiect of the left coracoid of Lama robxtstus. Same bone as shown in 
Figure 1, with the "costal process” restored in dotted line in each case. 
Anconal asiiret of left hiimcnis of LiriM oregomta ; distal extremity indicated by dotted line, 
hr tnr awisUiico of the corresjionding bone from a skeleton of Larva delawareutia. 
Anconaf a*p^ of left humerus of Aon/* delawarensia, showing the obliquity of the osseous 
|iartilian in the fnaaa /meiimatietig, as compared with the same structure seen in A. 
orw^NH* (fig. 8). (Author's collection). 
Anterior M|>cet of the proximal fourth of the left tarso-metatareus of Aoi«'/o aoda/ia. 
(( ope rolicctioii). 
IHrret anterior view of a specimen of the right coracoid of Phakicrocornx wacropus. Imper- 
corresjionding bone from a skeleton of Phalacroeorax 
Anlerior view of a left tarso-nietataraiis of Phalacroeorax macropus. 
liiroet outer view of a left lare/emetaUrsus of Phalacroeorax maerojma. .Same siiecimen as 
IS shown in !■ igtire ' 
Idcft Mijierior 0^118 mandible, and the hinder part of the mandible of 
the present dav. * * tendons. They agree with the Ravens of 
ght humerus of a sjiecimen of Branta propinqva. 
Flo. 1. 
Fio, % 
Fio. 8. 
Flu. 4. 
Fio. 5. 
Fio. B. 
Flo. 7. 
Kio. «. 
Flo. ». 
Fai. 10. 
Fio. 11. 
Flo. 12. 
Fio. 13. 
Fio. 14. 
Fa*. 1.1. 
Fio. IB. 
Fio. 17. 
