3^ KC^I-L-S HKDS OK THE OREGON DESERT. 
, the nu.ue of i- tl- -w extinct species. 
Ui.f- •!.. nov. ^ coracoid of the left side, which is i^erfect e.vcept 
Tina H|H-ciea « ^ ^ » the tip of the scapular process, and 
for the lirt-okiiiK «> gternal facet at its lower end. The bone 
*• and stouter tlian the corresponding element in Larus glaucns, 
tl^^il i sehanu-tersare almost identically the same. was a 
; 1 ™H.er smaller than L. glancns which it may easdy have been closely 
nit.™ Jmlging fn.m its coracoid, it differed not a htt e rom the s^c.es repre- 
^.ingthe “ Herring Hull ” group, as the characters of that bone differ quite j^r- 
r..plihlv in them. The coracoids of Gulls, however, of all sizes are very much alike 
in the matter ..f characters. Some long bones of the limbs, obtained in the same 
hrality, many lawsibly have Ixilonged to a species of this Gull. The data at my 
roi.iiii«n.l will i».t iKTinit me to say whether this species was abundant during the 
time in which it existeil. (See figs. 1 and 2, PI. XV). It was discovered by Pro- 
feMor K. I>. Po|H*» assistant, .Mr. Charles II. Sternberg, in tlie E<iuus Reds of the 
Silver hake n*gion, On-goii. 
CAUroMKICfsT 
Five <x>niroiils in the collection, more or less imperfect, are of about the right 
siw to have iK-hnigiil t.) this siK'cies of Gull. There are also the lx‘st part of two 
hunieri. |H*rfect ns far as they go, and a tarso-metatarsus, all of which may repre- 
wnt this hinl. Though carefully compared, the species is only entered hem pro- 
visionally until iiiore material is secund. 
S|K*ciinens uhtniiuHl ns in the last described sjiecies. 
laNl** OHKOOKCS sp. DOV. 
This s|M*cies. now extinct, was about the size of Larus dciatvarcttsis, and is 
InunhI u|M>n two humeri lioth fixim the left side of two individuals. There 
is also a |KTfwt, or very nearly iierfect, coracoid, and the superior half of another 
«»iie. togi'thcr with 8t*veml tarso-metatarsi, which may have belonged to the same 
sjuTies. The hiiinenis not lx*ing perfect I cannot give its length ; its shaft is 
stouter than the hunienil shaft in iMrus dclawaretisis and the proximal extremity, 
the wlmle head of the bone, is almost exactly alike in the extinct and existing 
siKvies. Then- is, however, a very good distinguishing character, for the osseous 
I^ition that .hvides that gn-at concavity uito two compartments overarched by 
the ulnar cn-st, is in L. dclatcHircisis, oblique to the plane of the long a.xis of the 
shaft, when-as in Larus oregonus it was about parallel. In this character L. oregonus 
G^Inl ^ distmguishing one among 
OmaMr""''"'' Cope in the Equus Beds of Fossil Lake, 
