262 



OSTEOLOGY OF TUBINAEES AND STEGANOPODES. 



either supraorbital glandular depression from the corresponding crota- 

 phyte fossa. 



Regarding this .skull from above, we arc to note how profoundly it is 

 impressed by the glandular pits; that they do not meet in the median 

 line, and, further,that their position agrees precisely with whatwc found 

 iu Oceanodroma. A shallow, median groove here marks the skull, the 

 remainder of which is smooth and globular. Viewed from behind, the 

 peculiar form and position of the deep crotaphyte fossae forces itself 

 upon us, and the jutting sphenotic processes come directly into view. 

 tJnderneath, the skull presents us with many points of interest. 



Fu,.3. 



FlO. -. Right lateral view of the skull of Fulmarus glaeialis rodgersii, <J. 



Fir,. :*.. Same form above, mandible removed. Both figures drawn by the author from specimen 12013 

 of the Smithsonian collection. Life size. 



The superior mandible is canoe shaped, with its prow to the front, 

 and its deep concavity extending to the rear. 



The maxillo-palatines are elliptical disks tilted up as in the Laridm, 

 and encroaching for their entire inner margins upon the interpalatine 

 space, where they are well separated from and parallel to each other. 



Of extraordinary size, the vomer (Fig. G) in this Fulmar is of an elon- 

 gated, cordate form, nearly ilat, being slightly concave above; carinated 

 in the median line beneath, with its anterior tip somewhat depressed . 

 and, finally, meeting the palatines behind as usual, these latter bones 

 have to curl to one side to clear it laterally, for this vomer forms a very 

 complete floor to the rhinal chamber without coming in contact with its 

 neighbors. 



