646 RK. W. SHUFELDT 
At this writing, the specimens are in the collection of the 
Geological Department of the Peabody Museum of Natural History, 
Yale University (Orig. No. 2831, Mus. No. 1233); found five miles 
west of Green River City, Wyo., in the fish cut of the railroad. 
Collector, F. A. C. Richardson (1874), Powell Exp. It was asso- 
ciated with insects described by Dr. Samuel H. Scudder. 
On the other side of the label accompanying this material, 
apparently in the same handwriting, I find: “Compare Plerop- 
tochidae; see Ibis, 1874, p. 19 (July), for sternum with 2 emargina- 
tions in Sternum.” This will be commented upon farther on. 
- The slabs are light colored and thin, and I have so arranged 
them in Fig. to that the fossil bones (0) and their impressions 
(a) bear the relation to each other that they would have had 
they been on the opposite pages of a book, and we had opened it 
to examine it." 
The bones on the slab 0 are as follows (and the impressions of 
all of them are seen on the slab a, which, with but one or two excep- 
tions, are brought out with marked distinctness) : 
t. The sternum (in part: ventral aspect). 
2. Both coracoids. 
3. Os furcula. 
4. A scapula (left). 
5. Humerus (left: proximal moiety). 
6. Ulna (right: nearly perfect). 
7. Radius (right: nearly perfect). 
8. Bones of manus (right: very faintly indicated, and some not 
exposed). | 
The feathers have already been referred to in a previous para- 
graph. 
This skeleton belonged to an adult bird about the size of a 
cactus wren (Heleodytes). 
The sternum.—Upon very close and careful examination with a 
high-power lens, we are enabled to observe the fact that the posterior 
margin of the sternum of this bird possessed two notches upon 
either side of the keel or carina; there is just enough of the bone 
On the opposite side of the slab (6) there is a small fossil fish, lacking three- 
fourths of the fore part of the skull; approximately, it had an extreme length of about 
76mm. 
