LITHORNJS. 3§ 



portionatoly smaUer than in any existing genus', although the 

 Hparrow-Hawk makes the nearest approximation in the former and 

 Circus in the latter respect. 



The undermentioned pelvis seems to leave little doubt that the 

 genus is truly Accipitrine. 



Lithornis vulturinus, Owen \ 



The type and only described species. Of the approximate size 

 of Faico jperegrinus. 



Hah. Europe (England). The type specimen is in the Hunterian 

 Collection of the Eoyal College of Surgeons. 



The undermentioned specimens, which are provisionalhj referred to 

 this species, luere, lilce the type, obtained from the London Clmj 

 {Lower Eocene) of the Isle of Sheppey. 



33138. Fragment of rock, showing the crushed and imperfect ster- 

 num, several of the ribs, fragments of the coracoids, and 

 the proximal half of the left humerus. The sternum 

 approximates to the Aceipitrine type, clearly having had 

 but a single small vacuity on each side of the distal border, 

 and showing the large postcoracoidal plate found in exist- 

 ing forms. The humerus, of which the dorsal aspect is 

 exposed, presents no characteristic features. Purchased. 



A. 56. The imi)erfeet pelvis and sacrum. In the marked deflection 

 of the postacctabular region of the dorsal sui-face of the 

 ilia, as well as in the complete closure of the vertebral 

 intervals by bone, this specimen agrees with recent 

 Accipitres and differs from all other forms. 



Presented by W. H. Shrubsok, Esq., 1884. 



1 The alleged resemblance to Catharfcs in these points has not been found 

 to hold good. 



- Trans. Geol. Soc. ser. 2, vol. vi. p. 20() (1841). 



D 2 



