444 BULLETIN UNITED STATES GEOLOGICAL SURVEY. 



One of the specimens affords the following measurements : — 



Inches. 



Humerus, length 0.80 



Forearm, length iO. 95 



Manus, length j.02 



Coracoid, length ' 0. 72 



Clavicle, length 0. 6;} 



Tibia, length ..„ I.OO 



Tarsus, length 0.60 



Middle toe and claw 0.65 



Claw alone ,2 0. 20 



Hind toe and claw. ■.., 0.37 



Claw alone 0. 15 



Wing.. : , , 3.60 



Tail (approximate) 2.70 



Total length (approximate) 6.85 



The bones still rest in the original matrix, and, being somewhat 

 crushed and flattened, do not admit of detailed description and com- 

 parison with other types. The furculum is well preserved, and the 

 limb-bones are all in place in their natural relation. The sternum is 

 unrecognizable. The position of the cervical series of vertebrae and 

 the general outline of the skull can be traced; but no structural char- 

 acters of the head can be distinguished, except the proximal portion of 

 the mandible. The long bones all present a well-marked longitudinal 

 groove, due evidently to compression and fracture. This groove is 

 distinctly traceable, even in such slender bones as tibiae, tarsi, and 

 clavicles. In point of size, while the furculum and the bones of the 

 wing have all about the same length as the corresponding iDarts in 

 Ampelis cedrorum, they apparently are considerably stouter. Their 

 greater breadth may, however, be due simply to flattening from pres- 

 sure. The tibiae and tarsi are a little shorter than in the species last 

 named, but the difference is only slight. 



The most remarkable feature of the specimen is the definiteness of the 

 feather impressions. Both the shafts and the barbs are shown with 

 great distinctness in the rectrices, and the tips of the primaries of one 

 ■wing are also sharply defined, overlying the edge of the partly expanded 

 tail. The tip of the opposite wing can also be seen beneath the tail. 

 The feet are so beautifully preserved that even the claws are perfectly 

 distinct. (Plate I, fig. 1.) 



Another specimen from the same locality, and probably representing 

 the same species, consists of the tip of the tail and about the apical 

 third of a half-expanded wing. (See Plate I, fig. 2.) In this example 

 the tail is also pointed and graduated. About seven of the outer pri- 

 maries of the wing are shown with great distinctness, and two others 

 can be easily made out. The third primary is the longest ; the second 

 is slightly shorter ; the first and fourth are about equal. There are also 

 in the collection three detached contour feathers of small size, but whether 

 pertaining to the same species as the other si^ecimens cannot, of course, 

 be determined. 



