Shufeldt: Birds from Bermuda. 367 



each other. These latter have an average width of 4 mm. and are 

 most conspicuously excavated. Either one extends from the lacrymal 

 of its own side to the prominent postorbital process behind. These 

 glandular depressions are a striking feature of the dorsal aspect of 

 the skull in all the Petrels known to me, as well as in the Shearwaters 

 and other sea-fowl. 



The frontal region of the skull under consideration is broad and 

 extensive; mesially, in the depression over the naso-premaxillary part, 

 is to be noted the persistent remains of the frontal processes of the 

 premaxillary. This is present in all eight of the skulls of ^strelata 

 vociferans before me. This character is seen in most, if not in all, 

 Shearwaters of the genus Puffimis, and faintly so in Daptioii. 



Between the external narial apertures the culmen is very narrow 

 at its middle, but slightly expanded anteriorly and posteriorly. Either 

 narial aperture is elongate, narrow, and elliptical in outline. This 

 form of opening, then, is as much rounded behind as it is in front; 

 so that the term " schizorhinal " is hardly applicable to a skull thus 

 characterized. 



Beyond the narial apertures the superior mandible is elegantly 

 arched upwards, being bounded on either side posteriorly by the 

 grooves continued forwards from the narial openings, and extended 

 downwards at the apical extremity into a sharp-pointed tip. (Fig. 5> 

 PI. XVI.) 



Passing to a direct posterior view of this skull, we are to note the 

 curious form of the postfrontal processes, each standing out from the 

 side of the skull in such a way as to resemble a small ear, marked on 

 its hinder surface by the extension forwards of the crotaphyte fossa 

 of the same side. These crotaphyte fossce are most conspicuously ex- 

 cavated, though they do not meet over the unusually large " supra- 

 occipital prominence " posteriorly. Their margms are sharp and to 

 a slight extent elevated, especially the inferior ones. Supraoccipital 

 foramina are not present in this skull ; neither do we find those open- 

 ings in the skulls of the Pnffinincc nor in the Fulmars. Indeed, the 

 rear view of the skull of this extinct Petrel here being considered 

 closely resembles the same aspect of the skull in most species of 

 Fulmarus}^ 



13 Shufeldt, R. W., " Contributions to the Comparative Osteology of Arctic 

 and Sub-arctic Water-Birds." Part I, Journ. of Anat. and Phys., Lond., 



