288 MR. W. P. PYCRAFT ON THE MORPHOLOGY AND 
Fig. 4. Lateral aspect of a portion of the skull of Casuarius sclateri, showing the 
frontal, nasal, and median elements of the casque. 
Fig. 4a. Dorsal aspect of fig. 3 a. 
Fig. 48. Dissection of a skull of Caswarius sclateri=fig. 3a, showing the mesethmoid 
and a portion of the ventral border of the median ossification of the 
casque interpolated between the mesial border of the anterior ends of the 
frontal. 
Fig. 5. Lateral view of the synsacrum of a young Casuarius unappendiculatus after 
removal of the right innominate, to show the great height of the neural 
spines of the vertebre. 
Fig. 6. Lateral view of the synsacrum of an embryo Dromeus nove-hollandie (p. 212), 
prepared for comparison with fig. 5. Note that at this stage the neural 
spines have not yet risen above the centra of the vertebre, but form only a 
series of lateral wings. 
Fig. 6.2. Dorsal aspect of a portion of the synsacrum (fig. 6), to show more clearly 
that the neural spines do not rise above the centra as in the adult 
condition (fig. 5). 
Fig. 6 J. Lateral view of the same pelvis (fig. 6), to show the separate elements 
of the innominate. 
ADDITIONAL LETTERS. 
ant.=anti-trochanter. | o.p,fr.=orbital process of frontal. 
f.c.=frontal moiety of casque. p.=pubis. 
i. =ilium. p.p.=pectineal process. 
il.is.f. =ilio-ischiadic foramen. pubo-isch,f. = pubo-ischiadic fissure. 
is. =ischium. s.c.=sacrai vertebra 1-2. | 
1b. 1-6 =lumbar vertebre 1-6. s.cd.=sacro-caudal vertebre. Synsactel 
1. 1-2=lumbo-sacral vertebree 1-2. s.th.=sacro-thoracic ,, | verteb re 
me.c.=median element of casque. v.=vyestigial thoracic rib. 
n.c.=nasal element of casque. v.me.=ventral border of mesethmoid. 
vb, =obturator fissure. 
PLATE XLY. 
Fig. 1. The buccal cavity of Rhea americana (p. 248), to show the large choanz 
characteristic of the Palwognathe. 
Fig. 2. A neossoptile of Calodromas elegans (p. 162), after Pycraft, to show the large 
aftershaft, equalling the main shaft in size, the complex rami of the main 
shaft, and their production forwards into horny filaments resembling the 
grooved ribbon-shaped bands of the young Ostrich (fig. 7). 
Fig. 2a. A radius from the distal end of the main shaft. 
