258 O. C. Marsh—New Tertiary Birds. 
This unique fossil was found by Mr. G. M. Keasbey, of the 
Yale party, in September last, near Henry’s Fork, Wyoming. 
Aletornis gracilis, sp. nov. 
A small aquatic bird, about the size of a Woodcock, is oe 
sented in our Wyoming collections by the proximal end o 
humerus in excellent preservation, and probably by some me 
important remains. The species thus indicated may be placed 
provisionally in the genus Aletornis, until the discovery of ad- 
ditional material determines more closely its affinities. fare: 
the head, on the paren side, the surface is concave. 
Measurements. 
Greatest diameter of proximal end of humerus, - - -- - ---- 114 
Greatest Seer of articutae ead 7. nase ws tA 84 
Loast Giimeter. | oo a a a ee 3°6 
Least Y See of shaft below hend,. 22.3.2... tcc 3°6 
The specimen here described was found by Mr. H. D. Zieg- 
ler, in September last, near Henry’s Fork, Wyoming. 
Aletornis bellus, sp. nov. 
A diminutive species, about half the bulk of that last - 
scribed, and which may for the present be referred to the sam — 
genus, is indicated by the distal end of a tarso-metatarsal, an 
os tee by a few other isolated and less ween o ay spect- 
tarso-metatarsal is similar in its esse features 
to the same bone in the Killdeer plover (Higialiti a 
Suge and about the same size. The outer, or fourth, meta 
sal element, however, is more produced distally, and its ex 
ed is obliquely compressed. The trochlear groove in on 
distal end of the third metatarsal is not quite in the middle, 
outer articular surface being ee the larger. 
Measuremen 
Transverse diameter eee of distal end of tarso-. 
metatarsal, sed 
oof 
O' el6 oR 6 8 Cee C8 ee 4.8 8 6 ee Ee Se. ee 
Aunuboneunes aca of fourth metatarsal at —_— end, 3° : 
Transverse Soe of shaft through lower foramen P 
found 
s at present representing this scans were 
Set ‘ee LTE, at Grizzly Buttes, Wyoming, in September last. 
