jlj,, KyL'L'S liKDS OK THE OREGON DESERT. 
/. «n.l /.. OtI.en. than these Professor Cope does not men- 
**"" mammalian types were overlooked, but what 
hM juHt Ut-n givtMi will Ik.- Huflicient to indicate the kind of mammals winch at the 
pn-m-nt time are uKaociated with the existing avifauna. 
HKICr KKMAKKS I'l-O-V TIIK 1-KKlII.STOKIC VKRTEBRATE LIFE OF THE REGION, EXCLUSIVE 
OF BIRDS. 
The Silver Lake region of Oregon is considered to be of the latest Tertiary 
fonnafiou, of the horizon' known as the Equus Beds. These beds exist in other 
,mrU of North America, but those furnishing the greatest number of Vertebrate 
f.-Miils exist in luhlition to the Unmlity now under consideration, in the valley of 
Mexieo. ami in Soutliwestern Texa.s. 
The ()n-g«»n eollw-tion furnished Professor Cope with several fos.sil fish fonns, 
the mnjoritv «»f which were new to science. These were Leucus altar cus, Jilyloleucus 
gihhartus, Cliola au/^uslarca, Calostomtis labiatus, and C. batrachops. 
Fossil .Mamnmlia of the region were particularly remarkable, the following 
Is-ing a list of them : 
llolomcuiscus vitakerianus Cojie. 
Holotncnisciis hestcrniis Leidy. 
Eschatius lonprostris Cope. 
Eschatius conidens Cope. 
Equus major DeKay. 
Equus occidcntalis Leidy. 
Equus excclsiis Leidy. 
Elephas priuiigaiius Blum. 
Cauls lairatis Say. 
Lulra ? piscinaria Leidy. 
Castor jiber L. 
Ai’icoia sp. 
Thomotuys bulbivorus Licht. 
Thomomys ? clusius Cones. 
Mylodon sodalis Cope. 
Tlie phalangi' of a Ix-ar was also found, and as there were numerous fossil 
iKim-sofniainmals and fishes and other vertebrates commingled with the bones of 
f.MM.il hinls s,.i,t on to me, I can further say that the above list could be extended 
by a mmilK-r of the smaller rodentia such as rabbits, gophers and others 
It will l«. .>l«.mHl lliat tl.oro is an absence of tapirs, peccaries, opossums and 
wlm-li. ( „|a. «.js, “ one would dml in similar company in corresponding 
bwls 111 the Kastcni States . no 
As to the pn-senee or absence of 
teml everj where in the dcixisit were 
man the authority just quoted says, “ Seat- 
tle obsidian implements of human mamifac- 
