Fossil Birds in the Marsh Collection of Yale University 57 



here to be described was one of that group, and the fossil bones repre- 

 senting it are ample to establish its presence in the above-named 

 formation. They belonged to an adult indi\adual; are thoroughly 

 fossilized and in fairly perfect condition, after I had fastened in situ 

 the several fragments representing the two humeri. 



In addition to three small bits which I have not determined, 

 there is in the lot what appears to be the head of d, femur, so imbedded 

 in a firm matrix as to be unrecognizable and useless. A vertebra, 

 apparently one of the ultimate cervicals, is in a somewhat better con- 

 dition, and it would appear, belonged to this individual. There is the 

 proximal half of a right ulna, nearly perfect as far as it goes; the distal 

 moieties of the two humeri, and an imperfect left tarso-metatarsus, 

 which lacks the proximal portion of the bone as well as the internal 

 trochlea. 



These humeri, the ulna, and the tarso-metatarsus I have carefully 

 compared with the corresponding bones of specimens in the collec- 

 tion of the United States National Museum of Phalacrocorax urile, 

 P. carho (No. 18851. See PI. XV), P. perspicillatus, P. dilophus, 

 P. mexicanus, and various other species; to none of these, however, did 

 the present extinct species belong. It was a form larger than P. urile, 

 and somewhat smaller than P. carbo, to which it appears it was most 

 nearly allied. 



The humerus in Phalacrocorax marinavis, in so far as its distal 

 extremity is concerned, presents the usual characters of this bone in 

 Cormorants. Both articular tubercules are very conspicuously 

 elevated, and the proximal end of the radial one is drawn out as a/rce 

 point, which is directed toward the middle of the shaft, pointing, as 

 it were, toward the well marked and oblique depression for the 

 brachialis anticus muscle. On the palmar aspect of this end of the 

 humerus the several grooves for the tendons are unusually deep, and 

 there is a pronounced conca\aty palmad to the ulnar tubercule, with 

 another circular one to its outer side, on the projecting part of the 

 bone there found. The shaft is smooth and somewhat compressed 

 transversely. 



In P. marinavis the proximal end of the ulna possessed in life the 

 peculiar conspicuous process for articulation with the head of the 

 radius; its apex has been broken off and lost. The tubercules for the 

 quill-butts down the shaft are in a double row as in all Phalacrocor- 

 acidce. 



With respect to the tarso-metatarsus, it exhibits all the characters 

 of birds of this group, as the large foramen for the anterior tibial 



