1896.] NATURAL SCIENCES OF PHILADELPHIA. 515 



The fi-agment of bone in specimen No. 24 is from an Owl — the 

 extinct Bubo arvernensis of Milne-Edwards (see Oiseaux fossiles, At- 

 las 2, Plate 192, figs. 11 and 15). 



No. 25 is the humerus of some medium-sized bird equal to about 

 that of Tringa gracilis of Milne-Edwards, but it did not belong ta 

 that species. It is non-pneumatic, with characters in niuay re- 

 spects agreeing with the humeri of small water birds, as plovers or 

 sand pipers, but it lacks the epicondyloicl jwocess possessed by this 

 bone in both Gulls and Tringce. It has a length of 3.5 centimeters. 

 I do not care to pronounce upon it before comparing with fuller 

 material. 



No. 26, a small bird's ulna, but 2.1 centimeters long and -with a 

 very sharp olecranon process, comes in the same category as Nos. 

 19-23, (see remarks above). Its shaft is distinctly marked by 6 

 papillse for the quill-butts of the secondary feathers, they being 

 about 2 mm. apart. 



The bones in Nos. 30 and 31 are the distal ends of the tarso- meta- 

 tarsi of small Gulls of the genus Larus. The first I take to have 

 belonged to an individual of the extinct species Larus totanoides^ 

 and the other to the somewhat smaller species Larus elegans both of 

 Milne-Edwards.' I am the more convinced of this, inasmuch as I 

 have compared them, at least in the case of Larus elegans, with a 

 number of the fossil tarso- metatarsi of that extinct form in the pal- 

 seontological collections of the U. S. National Museum, and the 

 agreement is altogether too close to admit of any doubt. 



Explanation of Plate XXIV. 



Fig. 1, Left tarso-metatarsus of P((^nus aryernensis, anterior aspect, 

 natural size. From a drawing by Prof. Alphonse Milne- 

 Edwards. 



Fig. 2. Left tarso-metatarsus of P?f^/r»s arverne?ists. Same bone as 

 shown in figure 1. Natural size, and viewed upon its exter- 

 no-lateral aspect. 



Fig. 3. Right tarso-metatarsus of Pi/^ntts eyermani, anterior aspect,, 

 natural size. Drawn by the author. 



Fig. 4. Right tarso-metatarsus of Puffinus eyermani. Same bone as 

 shown in figure 3. Natural size and viewed upon its exter. 

 no-lateral aspect. Drawn by the author. 



^ Oiseaux foKsiles, Atlas 1, Planche 57, fig, 12. 

 ' Loc. cit., Planche 56, fig. II. 

 34 



