56 ON THE OSTEOLOGY OF THE EURYL^MID/E. [May 2, 



But this point, as well as the status of the "Passeres Clamatores," 

 I propose to deal with in a furthei- communication at no distant 

 date. 



xi. List of Literature referred to. 



(1) Beddard, F. E. — The Structure and Classification of Birds. 



(2) Forbes, W. A. — " Contributions to the Anatomy of Passerine 



Birds." Parts II., III. P. Z. S. 1880. 



(3) Furbringer, M. — " Zur vergleich. Anat. des Brustschultes- 



apparates." Jenaisch. Zeitschr. f. Naturwiss. xxxvi. 1902. 



(4) Gadow, H. — Bronn's Thier-Reich. Systemat. Theil. Band vi. 



Yogel. 1893. 



(5) Garrod, a. H. — " On some Anatomical Characters which bear 



upon the Major Divisions of the Passerine Birds.'" Part I. 

 P. Z. S. 1876. 



(6) Mitchell, P. C. — " On the Anatomy of Gruiform Birds." 



P. Z. S. 1901, vol. ii. p. 629. 



(7) Sharps. R. B. — A Review of Recent Attempts to Classify 



Birds. 1891. 



xii. EXPLANATION OF PLATE II. 



Fig. 1. Inner aspect of skull of nesilmg Eit^ylaimis shovihig the large area occupied 

 by the squamosal. 



1 a. Outer view of same skull showing the peculiar form of the squamosal. 



2. Side view of Calyptomena viridis showing the peculiar lachrymal, large 



narial aperture, and large and spongy antorbital process. 



2 a. Ventral view of same skull to show the vomer, maxillo-palatine processes, 



and wide-set palatines. 



2 J. Dorsal aspect of same skull to show the large size of the nasal fossa and 



the nasal hinge. 



3. Ventral aspect of skull of Cymhirhj/nclms showing the slender maxillo- 



palatine processes, short vomer, and sharply bent palatines. Note the 

 difference between the palatal surface of this species and that of 

 Cal yptomena . 



3 a . Dorsal aspect of same skull to show the closing in of the nasal fos? a and 



the formation of pseudo-nasal apertures. 



4. Dorsal aspect of the skull of Corydon to show the large size of the narial 



apertures and nasal hinge. 



JExplanatioii of Letters. 



a.o.p. = antorbital process. 



als. = alisphenoid. 

 a.p.v. = anterior palatine vacuity. 

 b.oc. = basi-occipital. 

 b.s. = basisphenoid. 

 ex. = exoccipital. 

 fr. = frontal. 

 7i.pt. = hemipterj'goid. 



I. = lachrj'mal. 

 mes. = mesethmoid. 

 vtx.p. = maxillo-palatine. 



na. = nasal. 



ii.h. = nasal hinge. 



p. = parietal. 

 pa. = palatine. 

 pi.na. = posterior nares. 

 p.o.p. = postorbital process 

 pro. = prootic. 

 pt. = pterygoid. 

 s.v. = septum nasi. 

 sq. = squamosal. 

 V. = vomer. 



