278 MR. W. P. PYCRAFT ON THE MORPHOLOGY AND 
Dromvs. 
a. Length 17 in.; pectineal process well developed ; dorsal border of pre-ilium 
much arched ; obturator fissure nearly closed ; pubo-ischiadic fissure nearly 
closedi.< ™ Toten: : . . . « D.nove-hollandia. 
5. Length 94 in.; pectineal process Preplete figs honter of create not 
arched ; obturator fissure wide ; pubo-ischiadic fissure very wide. . . . D. ater, 
E. PrecroraL Lime. 
A. Extended forearm and hand longer than the humerus; ulnare resembling 
that of the typical Neognathe ; radius and ulna long, with but a narrow 
chink between them; distal end of Me. II. flabelliform . . . . . . . Rhea. 
B. Extended forearm and hand much shorter than the humerus. 
a. Humerus with a shallow, but blind subtrochanteric fossa; a very strongly 
developed linea aspera for the triceps, forming a conspicuous triangular 
ridge; radius and ulna short and bowed; ulnare a simple nodule ; distal 
end of Me. II. not markedly expanded; manus as in Rhea, resembling 
typical carinate form, though too small for purposes of flight . . . . Struthio. 
4. Humerus much bowed, without subtrochanteric fossa or indication of 
pectoral crest; radius and ulna with but a very narrow chink between 
them; a vestigial radiale and ulnare; a vestigial pollex bearing an 
unequal phalanx, with the Me. III. incomplete and free distally . . . <Apteryz. 
C. Extended forearm and hand about equal to the length of the humerus; a 
subtrochanteric fossa ; radiale and ulnare anchylosed with metacarpals. 
a, Subtrochanteric fossa large ; ulnare indistinguishable; radiale anchylosed 
with radius and carpo-metacarpus, but distinguishable. . . . . Casuarius. 
6. Subtrochanteric fossa very small; no carpal elements fisknoatiahebles 
neither pollex nor third digit represented. . . . . . . . + . « Dromeus, 
F, Petyic Line. 
When the bones are pneumatic only the femur is conspicuously so; save in the Dinornithide 
the extensor bridge is wanting; the hallux, when present, is never large. 
a. Toes three in number ; tarso-metatarsus far exceeding femur in length. 
a', Ectocnemial crest large, rivalling the procnemial in size; ento-condyle with 
a deep lateral pit; distal extremity of shaft above entocondyle (lateral 
surface) with a deep groove. 
a, Procnemial crest extending down the shaft; femur with a large 
pneumatic aperture . . . . Ry aie iu utidice Sac laa pei Dromeus: 
b!, Procnemial crest not extending a the chat; femur non-pneumatic; 
ungual phalanx of inner toe greatly elongated . . . . . « + « Casuarius. 
b!, Ectocnemial crest small, a mere tubercle of the procnemial; no ento- 
condylar pit or groove on the lateral surface of thé shaft; a moderately 
ccnspicuous extensor groove ; popliteal fossa of the femur very deep; 
ungual phalanges laterally compressed. . . . . « - + + « + + Rhea, 
