PHYLOGENY OF THE PALSOGNATH^ AND NEOG-NATH.E. 



287 



Fig. 5 



Fig. 



Fig. 

 Fig. 

 Fia. 



Fig. 7 



Fig. 8 



a. Lateral aspect of skull of Bhea americana, to show sutures. Note the 

 vertical spine (lachrymo-nasal pillar) from the maxillo-palatine process, 

 which replaces the maxillary process of the nasal ; the remarkably small size 

 of the quadrato-jugal; and the outer and inner views of the lower jaw. 



b. Lateral aspect of pterygoid of Rhea americana (p. 191), to show its relations 

 with the vomer. 



c. Outer aspect of mandible of fig. 5, to show sutures. 



d. Inner aspect of mandible of fig. 5, to show sutures. 



Quadrate of Bubo maximus, to show double, widely separate, squamosal articular 



head. Nat. size. 

 Quadrate of Dromceus irroratus\, posterior aspect, to show single articular 



head. Nat. size. 

 Quadrate of Apteryx oweni, posterior aspect, to show double squamosal 



head. 



Additional Letters. 



o.A.=otic head of quadrate. 



o.7\ — orbital process of quadrate. 



p.= parietal. 

 p.f. = precondylar fossa. 

 pro. = pro-otic. 

 s.a. — supra-angular. 

 s.o. = supra-occipital. 

 sp.=splenial. 

 sq. = squamosal. 

 sq. h. — squamosal head of quadrate. 

 vaff.f. = vagus foramen. 

 vo.pr. — vomerine process of premaxilla. 

 l.p. = lachrymo-nasal process of premaxilla. 



«. = angulare. 

 als. = alisphenoid. 

 ar. = articulare. 

 ant. — antrum of Highmore 

 b.s. = basisphenoid. 



d. = dentary. 

 cor. = coronoid. 

 ep.o. = epiotic. 

 e#. = exoccipital. 

 f.f. = floccular fossa. 

 fr. = frontal. 

 m.= meatus internus. 

 mes. = mesethmoid. 

 Ojo. = opisthotic. 



PLATE XLIV. 



Fig. 1. Dorsal aspect of the skull of an adult Dromceus ater (p. 270), to show the 



conspicuous, embryonic, cerebral prominence and the fused lachrymals. 

 Fig. 1 a. Lateral view of the same skull (fig. 1), showing the cerebral prominence 



and temporal fossae. 

 Fig. 2. Dissection of a skull of a young Dromceus novce-hoilandice, lateral view, to 



show the form and position of the mesethmoid for comparison with fig. 3 



et seq. 

 Fig. 3. The mesethmoid of a young Casuarius unappencliculatus (p. 199), to show the 



mesethmoid and the large median superposed element forming the centre of 



the casque of the adult. 



