110 Mr. H. Seeley on some new Genera of Fossil Birds. 
bird was raptorial or natatorial. It bears evidences of having 
been eaten. 
Macrornis tanaupus, Seeley. 
Proximal end of right tibia of a large Struthious bird from 
Hordwell. It is as large as the Emu, but is further removed 
from the Emu than the Ostrich, in the struthious direction. 
Both pairs of sides are subparallel. The patelloid prominence 
arises from a narrower base than in the great Struthionide, 
and is produced into a considerable process on the inner side of 
the leg. There is an inflation at the back of the proximal end. 
The shaft is compressed, and the fibula-ridge is sharp. The 
points in which it is unlike known struthious birds are those 
which characterize some genera of waders and gallinaceous 
birds. 
Megalornis, Seeley. 
Lithornis emuianus, Bowerbank, Ann. Nat. Hist. 
Cast of original specimen in the British Museum ; and distal 
end of a right tibia exactly corresponding to it, from the London 
Clay of Hastchurch, in the Isle of Sheppey. Taking the Ostrich 
as a type, this bird diverges from the typical Struthionide on 
the other side of the Emu, yet appears to conform to the Casua- 
rine allies. The shaft is set on to the extreme back of the 
trochlear end, and is more robust than in the Emu. Also its 
posterior side is more rounded, and the inner side more angular. 
CRETACEOUS BIRDS. 
Mr. Lucas Barrett, in 1858, discovered bones in the Upper 
Greensand which he recognized as those of a bird allied to the 
Natatores. They are described, in Sir C. Lyell’s Supplement to 
the fifth edition of the ‘ Elements,’ as rather larger than those of 
a common pigeon. And Prof. Owen, in the second edition of 
the ‘ Paleontology,’ speaks of a trifid tarsus showing the outer 
toe-joint much higher up than the other two. Of neither of 
these are there any examples at Cambridge. But we have col- 
lected or seen a number of cervical, caudal, and dorsal vertebre, 
proximal and distal ends of tarsal bones, proximal ends of tibia, 
proximal and distal ends of femora, humeri, metacarpal bones, 
&e., which demonstrate the existence of a very distinct genus of 
birds in the Cambridge Greensand, of which I have named the 
typical species Pelagornis Barretti. 
Descriptions of these new genera will appear in the ‘ Cata- 
logue of Fossil Vertebrata in the Woodwardian Museum.’ 
