THE VOYAGE OF THE ' CHALLENGER.' 413 



My study of the osteology of the Tubinares has been chiefly based on 

 the material enumerated in the subjoined list. 



List of Osteological Material examined. Zo .^ x 



pt.xi.p.42. 



Oceanites oceanicus ........................... Skeleton. 



Fregetta melanogastra ..................... "... Do. 



Garrodia nereis ................................. Bones of trunk and of limbs. 



Pelagodroma marina ........................... Limb-bones. 



PKOCELLARIID^:. 



Cymochorea leucorrhoa ........................ Skeleton. 



Procellaria pelagica ........................... Do. 



Bulweria columbina ........................... Limb-bones. 



(Estrelata "grisea " ........... .............. Skeleton. "I 



- sp. inc. (also named griseus) ............ Do. ] W 



- lessoni ....................................... Two skulls. 



Majaqueus aquinoctialis ..................... Skeleton. 



Puffinus anglorum .............................. Do. 



- obscurus .................................... Do. 



- brevicauda ................................. Do. (incomplete). 



Adamastor cinereus .............................. Skeleton. 



Daption capensis ................................. Skeleton (Ey ton Coll. ) and skull. 



Aeipetes antarcticus ........................... Do. and two skulls. 



Thalassceca glacialoides ........................ Do. 



Fulmar us glacialis .............. ............... Do . 



Ossifraga gigantea .............................. Do. and skull. 



Prion desolatus ................................. Do. and three skulls. 



- vittatus .................................... Skull. 



Pelecano'ides urinatrix .................... .... Skeleton and sternum. 



Diomedea exulans .......................... '. . . Skeleton and skull. 



- brachyura ................................. Do. 



Thalassiarche melanophrys .................. Do. (Eyton Coll.). 



- culminoita ................................. Skull. 



Pkcebttria fuliginosa ........................... Two skulls. 



The skull (vide PL XXL figs. 4, 5, PL XXII. figs. 1-4). The rostrum 

 is long, and strongly hooded apically. It has no distinct hinge with the 

 cranium proper, but the cranio-facial notch is large, and the nasal and 

 premaxillary bones at their junction with the frontals so thin as to permit 

 of a considerable amount of vertical movement of the beak. 



The nares are large and " holorhinal," their posterior boundaries 

 being concave, and not extending, by some way, as far back as the 

 posterior ends of the nasal processes of the premaxillae. In the Diome- 

 deinse the nostrils are widely separated, and distinctly lateral in position ; 

 in the other forms they are closely approximated, and near the culmen. 

 The nasal septum is but little ossified, most so in the Diomedeinae. 

 There may be a couple of small ossifications in the floor of the nasal 



