512 PROCEEDINGS OF THE ACADEMY OF [1896. 



The shaft of the tibio-tarsus is somewhat flattened or compressed in 

 the antero-posterior direction, and its distal third, to some degree, 

 curves gently mesiad. The fibular ridge is well-marked, and occu- 

 pies rather more than the upper third of the external border of the 

 bone. Distal!}', we find the usual osseous bridgelet spanning the 

 deep tendinal groove upon the anterior aspect. In the intercondy- 

 lar space, posteriorly, there is a faint indication of a median longi- 

 tudmal lidge, that is also visible in Piiffinus borealis (fig. 8). The 

 tarso-metatarsus (Plate XXIV, figs. 3 and 4) is straight, and is grooved 

 for tendons the entire length of its anterior face, and faintly so upon 

 its posterior aspect. Distally the mid-trochlear process is placed the 

 lowest on the end of the shaft, while the internal one is the highest, 

 and is directed backward and slightly inward. The hypotarsus is 

 well-developed and is twice vertically pierced for the passage of 

 tendons, while faint groovings also exist upon its postero-external 

 surface. In the fossa at the proximal end of the bone, just below 

 the summit, are two small foramina piercing the shaft from before 

 backward. The sides of the shaft are flat. 



These bones were discovered in the Grotto Pietro Tamponi, Tavo- 

 lara, an island in the Gulf of Terranova, a few miles off" the north- 

 east coast of Sardinia. 



The species is extinct, and it gives me pleasure to name it in 

 honor of the well-known paleontologist, John Eyerman, Esq., of 

 Easton, Pennsylvania, in whose collection the specimens, at the 

 present writing, belong. 



The specimen marked No. 12, represents the upper part of the 

 right tibio-tarsus of a bird of some considerable size (see fig. 1 of 

 the text). Its procneniial process is slightly broken away above, 

 and the free margin of the summit of tlie bone behind is also chipped 

 away. 



We have in the National Museum a great number of specimens 

 of the fossil bones of birds received several years ago from Professor 

 Alf. Milne-Edwards, and among these, numerous examples of the 

 long bones of Palceolodus crassipes, P. amhiguus and others of the 

 genus, but this bone did not belong to a Palceolodus. Upon com- 

 paring with such material as I had of Pelecanns gracilis, it was 

 quickly seen that it never came from a Pelican, and the fact was 

 further confirmed by carefully comparing it with the tibio-tarsi of 

 numerous species of existing forms of that group. In short it has 

 been compared by me with every figure of the larger birds where 



