56 ON THE OSTEOLOGY OF THE EURYLAMID&. [May 2, 
But this point, as well as the status of the ‘‘ Passeres Clamatores,” 
I propose to deal with in a further communication at no distant 
date. 
xl, List or LivERATURE REFERRED TO. 
(1) Bepparp, F. E.—The Structure and Classification of Birds. 
(2) Forses, W. A.—* Contributions to the Anatomy of Passerine 
Bucdsy) Parts ies Ma ae Zias, es: 
(3) Firprincer, M.—“ Zur vergleich. Anat. des Brustschultes- 
apparates.” Jenaisch. Zeitschr. f. Naturwiss. xxxvi. 1902. 
(4) Gapow, H.—Bronn’s Thier-Reich. Systemat. Theil, Band vi. 
Vogel. 1893. 
(5) Garrop, A. H.—‘ On some Anatomical Characters which bear 
upon the Major Divisions of the Passerine Birds.” Part I. 
IP, Ay So MSG. 
(6) Mrrenent, P. C.—‘ On the Anatomy of Gruiform Birds.” 
lin Mop LEO, WOls il, 10, O28). 
(7) Suarpe, R. B.—A Review of Recent Attempts to Classify 
Birds. 1891. 
xii. EXPLANATION OF PLATE II. 
Fig. 1. Inner aspect of skull of nestling Hurylemus showing the large area occupied 
by the squamosal. 
Ua, Outer view of same skull showing the peculiar form of the squamosal. 
« Side view of Calyptomena viridis showing the peculiar lachrymal, large 
narial aperture, and large and spongy antorbital process. 
2a. Ventral view of same skull to show the vomer, maxillo-palatine processes, 
and wide-set palatines. 
2b. Dorsal aspect of same skull to show the large size of the nasal fossa and 
the nasal hinge. 
3. Ventral aspect of skull of Cymbirhynchus 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 
Calyptomena. 
3a. Dorsal aspect of same skull to show the closing in of the nasal fossa 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. 
Heplanation of Letters. 
a.0.p. = antorbital process. na. = nasal. 
als. = alisphenoid. n.h. = nasal hinge. 
a.p.v. = anterior palatine vacuity. p. = parietal. 
b.oc. = basi-occipital. pa. = palatine. 
b.s. = basisphenoid. pa. = posterior nares. 
ex. = exoccipital. /p.o.p. = postorbital process. 
Jr. = frontal. pro. = prootic. 
h.pt. = hemipterygoid. pt. = pterygoid. 
1. = lachrymal. S.n. = septum nasi. 
mes. = mesethmoid. sq. = squamosal. 
ma.p. = maxillo-palatine. v. = vomer. 
