24 



Annals of the Carnegie Museum. 



yond the osseous orbital border in front, the gland, during life, resting 

 there upon the tissues that overlie the eyeball superiorly. 



This tilting up of the superior orbital borders is best marked in the 

 curious skull of ^-E. semipalmata, where it offers a very striking feature. 

 In it, too, the supra-orbital glandular depressions are very distinct, and 



Tui.Z 



Fh;. I. A side view of the forepart of the skull of Charadrius plu7<ialis enlarged, 

 Mx, maxillary ; Mxp, maxilK)-palatine ; PI, palatine ; A'a, nasal ; /)-, frontal ; Eth, 

 «thmoid ; Z, lacrynial ; /';//. v, premaxillary. { After Huxley. ) 



Fig. 2. Under view of the same ( C phivialis^ partially dissected and enlarged. 

 '(After Huxley.) 



Fig. 3. 'iVwW o{ Charadrius squatarola : superior view. (Spec. 7963, Coll. U. 

 S. Nat. Mus.) 



Fig. 4. Left lateral view of the mandible of Cliaradrius squatarola. Natural 

 size. Figs. 3 and 4 drawn by the author. 



they each terminate anteriorly in a single, large subcircular foramen, 

 situated well within the external edge of the orbit. 



The fronto-parietal vault of the cranium is very smooth and rounded 



