se 
216 O. C. Marsh on Cretaceous and Tertiary Birds. 
Sciences in Philadelphia, and the extinct species it indicates is 
named for Dr. F. V. Hayden, whose explorations have added so 
much to our knowledge of the geology of the Upper Missouri, 
and Rocky Mountain regions. 
Graculus Idahensis Marsh, sp. nov. 
A. collection of Tertiary fossils from Idaho, lately received 
by Professor Newberry, of Columbia College, contained the 
greater portion of the left metacarpal bone of an aquatic bird, 
which he has kindly loaned to the writer for examination. 
he specimen is in perfect preservation, and has such marke 
characters that it will evidently admit of at least approximate 
determination. Among the most prominent features of the 
fossil, at its proximal extremity, are, the great anterior projec- 
very deep and broad. The fossa for the attachment of the in- 
ner lateral ligament of the wrist is also deep, and has, apparently, 
a small pneumatic opening near its center. Her branch 
of the metacarpal bone was slender, and but little separated 
from the larger one. Its outer edge at its superior attachment 
is on the median line, and opposite to this point, on the outer 
posterior edge of the large metacarpal, there is a small tubercle, 
to which the superior flexor ingot of the hand was attached. 
ea phe lower extremity of the specimen has, unfortunately, been 
ost. 
2 3 oa The principal dimensions of this metacarpal bone are as fol- 
aq Ows _—— 
Length of portion preserved, - - - - 45°™™* 
Transverse diameter of proximal extremity, - 16°2 
Diameter pana pisiform tubercle, - - - 81 
al articular surface, - -  - 72 
i 12° 
e lal apophysis, - -  - - 
Distance from inner superior edge to union of 
metacarpals, -  - ity +. 4 ee 
Greater diameter of large shaft where broken, ied 
related to the Cormorants, and may be placed provisionally in 
. 
