Shufeldt: Birds from Bermuda. 369 



The articulatory surface for the mandihle is irregular in contour and 

 extensive. The hody of the bone, inchiding the orbital process, is 

 greatly compressed transversely. 



I find no pterygoids in either of the collections at hand, but it is not 

 difificult to conceive what they were like. 



The qnadrato-jngal -or infraorbital bar is extremely slender, and 

 continues to be so until it joins the triangular, horizontally disposed 

 maxillary anteriorly. Its inturned articular nib for the quadrate, at 

 its free, posterior end, is very small. 



Posteriorly, the basis cranii is bounded by the semi-circular line of 

 the occipital crest, here forming the lower boundary of the crotaphyte 

 fossae. 



In some of these skulls the foramen magnum is almost circular in 

 outline, while in others it is distinctly cordate, the occipital condyle 

 being unusually small for a bird having the size that A^strelata vo- 

 cifcrans had, while its center, posteriorly, may or may not exhibit a 

 faint notch. 



The small foramen above and on either side of the foramen mag- 

 num has a deep though narrow groove running forwards from it. to 

 be lost on the basitemporal, between the occipital condyle and the 

 wing of the as squamosum. This pair of groovelets are very dis- 

 tinctive of the skull in Petrels and Shearwaters, and less in some 

 other tubinarine birds. 



The basitemporal region is smooth, nearly level, and triangular in 

 outline ; while beyond its anterior apex are to be observed the pair 

 of small, sessile facets, one on either side, for the pterygoids. Be- 

 tween these and the posterior, articular extremities of the palatines 

 is to be seen the inferior rounded surface of the sphenoidal rostrum, 

 which is exposed for a distance of several millimeters (fig. 4, 

 PI. XVI). 



The large vomer, with its decurved, pointed, anterior extremity, 

 fuses with a palatine upon either side, although these latter bones do 

 not anchylose together for their hinder moieties. Either bone, for 

 its latter or posterior half, has its internal and external margin 

 raised, while the dorsal aspect is developed as a scroll-like elevation. 

 Beyond, the prepalatine is much flattened in the horizontal plane, well 

 separated from the fellow of the opposite side, while most distally it 



