270 OSTEOLOGY OF TUBINARES AND STEGANOPODES. 



4. Fulmarvs.— Basi-pterygoid processes present and thorongbly devel- 

 oped, articulating with pterygoids. 



5. Oceanodroma.— Anterior tip of mandibular symphysis at the inter- 

 sect ion of the right lines forming the inferior ramal borders. Surangu- 



lar entire. 



5. Fulmarus.— Anterior tip of mandibular symphysis produced di- 

 rectly with its protruding process squarely cut across. Surangular 

 pierced by a foramen. 



<;. Oceanodroma. — Twenty-first vertebra of the spinal column free. 

 Kiphoidal extremity of sternum entire, its hinder border a transverse, 



straight line. 



0. Fulmarus.— Twenty-first vertebra of the spinal column anchyloses 

 with Hie pelvic sacrum. Xiphoidal end of sternum not entire, its hinder 

 border jagged with an evident predisposition to become two-notched. 



NOTES UPON SPECIMEN NO. 3G18, SUPPOSED TO BE A SKULL OF 

 PUFFINUS TENUIROSTRIS, AND OTHER MATERIAL. 



It will be impossible for me to state positively as to what mauner of 

 bird the skull No. 3618 of the tabulated list of material belonged, but 

 there is some reason to believe it to be that of a Shearwater. It is 

 evidently a specimen that has been picked up on the beach, and was col- 

 lected by Professor Dall at Oonalaska. Its basal points have been 

 much broken and all the small free bones lost. As I have already said, 

 my measurements of the specimen lead me to think that it is the skull 

 of P. tenuirostris aud from an adult bird. 



The superior mandible is upon the same type as Fulmarus, though 

 much modified. The supraorbital glandular depressions meet for a 

 short distance in the median line. 



The base of the orbit and surrounding parts are much as we find them 

 in the Petrels and Fulmars, but the optic foramen and the foramen in 

 the interorbital septum have run iuto one. Basipterygoidal facets are 

 present at the base of the rostrum. 



The crotaphyte fossa- are broad and deep, and meet the sides of the 

 supraoccipital prominence, to be produced to some extent from either 

 side, upon its dome. 



The foramen magnum is unusually large. 



In Puffinus major the pectoral arch and sternum has the general form 

 of the like parts in Fulmarus rodgcrsii, but differs from them in having 

 the l'urcula meet the carina of the sternum when articulated in life; in 

 having the sternum a pneumatic bone, as in the Albatrosses ; in the 

 sternal hotly being comparatively longer; and in having its xiphoidal 

 border two-notched and convex forward. 



. OBSERVATIONS UPON THE OSTEOLOGY OF DIOMEDEA ALBATRUS. 



Although made hugely upon the characters presented by the osseous 

 parts oft lie roof of their mouths, Huxley's remark, in his Classification 

 of Birds, that the ProcellariidoB were aberrant forms and inclined to 



