PHALACROCOKACtD.^. 47 



The two folloiuing genera may indicute a distinct family : — 

 Genus PELAGORNIS, Lartet '. 

 Founded upon the humerus, which presents many of the general 

 characters of that of Sala — such as the small size of the proximal 

 extremity, the slight development of the delto-pectoral crest, and the 

 absence of an ectepicondj'lar process ; but is distinguished by the 

 absence of an oleeranal fossa (in which respect it approaches Pde- 

 canus), and the abortion of the bicipital surface, 



Pelagoruis miocsenus, Lartet". 

 The type and only described species. Length of humerus 0,580 ; 

 or considerably longer than that of Diomedea exulans. 

 Hub. Europe (France). 



A. 167. Cast of the right humerus. The original was obtained from 

 the Miocene of Lcoguan, near Bordeaux, by M. Delfortrie, 

 and is believed to be in the Museum at the latter town. 

 It accords in aU respects with the type left humerus 

 figured by Milne-Edwards in his ' Oiseaux Fossiles do la 

 France,' pi. xlv. 



Presented hy Monsieur A. Milne-Edwards, 1890. 



Genus ARGILLORNIS, Owen \ 



Syu. Lithornis, Bowerbauk '. 

 Megalornis, Seeley '. . 



Apparently closely allied to the preceding genus, but (judging 

 from the idna) with an oleeranal fossa to the humerus. The skull 

 ascribed to this genus has all the essential characters of the Phala- 

 crocoracidte. The ulua has no proximal pneumatic foramen. 



Like the preceding genus, this form was regarded by its describer 

 as allied to Diomedea, with which it has not the remotest affinity. 



Argillornis lougipennis, Owen «. 

 Syn. Lithornis cmuiniis, Bowerbauk^. 

 Megcdornis etmiinus, Seeley ^. 



The typo and only described species ; fully as large as Pelagorais 

 mioccenus. 



1 Oomptes Reudus, vol. xliv. p. 740 (1857). * Loc. cit. 



3 Quart. Journ. Geol. Soc. vol. xxxiv. p. 124 ( 1878). 



■* Ann. Mag. Nat. Hist. ser. 2, vol. xiv. p. 263 (1854).— Preoccupied (see p. 34). 



* Ibii. ser. 3, vol. xviii. p. 110 (186(3).— Preoccupied by Gray, 1840. 



" Loc. cit. ~ Loc. cit. ■< Loc. cit. 



