PHYLOGENY OF THE PAL^OGNATH.E AND NEOGNATH.E. 



287 



Fig. 5 a. Lateral aspect of skull of Ekea 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. 



Fig. bb. Lateral aspect of pterygoid of Rhea americana (p. I'Jl), to show its relations 

 with the vomer. 



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



Fig. 5 d. hmer aspect of mandible of tig. 5, to show sutures. 



Fig. G. Quadrate of Bubo 7)iaximus, to show double, widely separate, squamosal articular 

 head. Nat. size. 



Fig. 7. Quadrate of Dromceus irroratusl, posterior aspect, to show single articular 

 head. Nat. size. 



Fig. 8. Quadrate of Apteryx oweiii, posterior aspect, to show double squamosal 

 head. 



Additional Letters. 



a. = angalare. 

 als. = alisphenoid. 

 ar. = articulare. 

 «»/. = antrum of Higlimorc. 

 b.s. = basisphenoid. 



«?. = dentary. 

 CO/'. = coronoid. 

 ep.o. = c])iot\c. 

 e.r. = exoccipital. 

 /./. = floccular fossa. 

 //•. = frontal. 

 »*. = meatus interuus. 

 mes. = mesetlimoid. 

 o/j. = opisthotic. 



(/./<. = otic head of quadrate, 

 o.r. =orbital process of quadrate. 



/>. = parietal. 

 p.f. = precoudylar fossa. 

 ^/•o. = pro-otic. 

 n.a. = supra-augular. 

 A\o . = supra-occipital . 

 syj. = spleuial. 

 «(/.=: squamosal. 

 .S(/./«. = squamosal head of quadrate. 

 v«(/./. = vagus foramen. 

 i;o./;/". = vomerine process of premaxilla. 

 /./». = lachrymo-nasal process of premaxilla. 



PLATE XLIV. 



Fig. 1. Dorsal aspect of the skull of an adult Droma'ns 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 novcf-hollandice, lateral view, to 



show the form and ])ositi(3n of the mesethmoid for comparison with fig. 3 



et seq. 

 The mesethmoid of a young Casuarius unappendiculatus (p. 199), to show the 



mesethmoid and the large median superposed element forming the centre of 



the casque of the adult. 



Fig. 3 



