PHYLOGENY OF THE PALZOGNATHA AND NEOGNATH ©. :269 
process of quadrate long, articulating with whole imner border with 
pterygoid ; olfactory cavity of great size . . . . . . . . « « Dinornithide. 
c. Vomer deficient posteriorly, not extending backwards to reach the pterygoid, 
anteriorly extending forwards, as in Dromeus, to conceal the parasphe- 
noidal rostrum; the body of vomer deeply hollowed, fitting closely on to 
the rostrum, and embraced on either side by the maxillo-palatine pro- 
cesses ; maxillo-palatine processes hastate ; anterior palatine processes of 
great size; pterygoid laminate; palatine rod-shaped, fused proximally 
with external border of pterygoid; premaxilla wanting a palatine process ; 
lachrymals continued backwards to fuse with a chain of supra-orbitals 
and with the frontals, so as to enclose a supra-orbital foramen ; Jachrymal 
with an osiculum lachrymo-palutinum ; nostrils holorhinal ; anterior narial 
and lachrymo-nasal fosse confluent; quadrate with long recurved 
process bearing a well-defined projecting facet for the pterygoid in 
the middle of its internal ventral border . . . . . c See Scruchio: 
B. Beak elongated, decurved, probe-shaped; anterior narial fon minute con- 
fined to tip of beak ; lachrymo-nasal fossa enormous, extending forwards to 
within a short distance of tip of beak; skull rounded, without post-orbital 
processes ; lachrymal vestigial ; olfactory chamber of great size, extending 
backwards to optic foramen; vomer passing backwards to fuse with the 
pterygoid and palatine, and, with these, helping to form the floor of a 
tubular recess opening inwards. . . .... » . Apteryx. 
Key to the Species. 
STRUTHIO. 
a. Maxillo-palatine processes not rising dorsad, the anterior border of the 
maxillo-palatine process at right angles to the long axis of the skull. 
a. Palatines projecting distad beyond anterior border of maxillo-palatine 
process ; maxillo-palatine processes without any external lateral fenes- 
trated plate: 8 7 mea pen © boat 0 c . SS. australis. 
t!. Palatines not reaching as far forward as the level of the anterior order of 
the maxillo-palatine process. 
a’, Vomer very short; parasphenoidal rostrum thick; maxillo-palatine 
processes with an external lateral fenestrated plate. . . . . S.molybdophanes. 
. Vomer very long ; maxillo-palatine processes without an external ‘iste al 
fenestrated plate; parasphenoidal rostrum slender ; roof of the skull 
with deep depressions mesiad of the supra-orbital ledges; nasals 
meeting in the middle line suite of the nasal process of pre- 
TONEY ln oF ek oF : - . . S.meridionalis’. 
b. Maxillo-palatine processes rising orendl: ; anterior Ponce of rose. malin 
processes sloping obliquely backwards ; vomer broad, with short, pomted, 
posterior limbs; palatines projecting distad beyond maxillo-palatine pro- 
CERRCS soa ee ce a eee tem ede Sh eh Sveamelus: 
1 We believe that Struthio massaicus (Neum.) is identical with this bird—W. R. & W. P. P. 
yoL. XV.—Part vy. No. 21.—WVecember, 1900. 2P 
