276 MR. W. P. PYCRAFT ON THE MORPHOLOGY AND 
a’. Width between inner angles of articulation for last sternal rib less than 
width across metasternum at widest. . . . + - «+ + + + + + GC, casuarius. 
6’. Width between inner angles of articulation for last sternal rib greater 
than width across metasternum at widest . . . . : . . C.c. beccarit. 
b. Coracoid grooves shallow, lower lip not strongly marked whe seen : ea 
above ; mouth of the pneumatic aperture produced forward into prominent 
lips; anterior lateral process short and recurved. Metasternal region 
very long and narrow. 
c’. Width across anterior lateral processes of sternum twice width of 
metasternum . . : ; - . . + . GC, bennetii. 
d', Width across anterior ineral process of eet ies fan twice width 
across metasternum . . . - . -. + + + +1/s + « +» » « « C.picticollis. 
D. Psetvic Arco}. (Pl. XLIV. fig. 5.) 
Synsacral neural spines of great height ; sacral vertebre, and sometimes the last lumbo-sacral, 
and first and second caudals with conspicuous pleurosteal elements ; pre-acetabular ilia always 
meeting in the mid-dorsal line above the neural spines of the synsacrum ; the synsacral neural 
spines never projecting beyond the level of the post-acetabular ilia; ilio-ischiadic fissure either 
permanently open or closed only by the fissure of the extreme ends of the ilium and ischium. 
A. Pubes remaining permanently free caudad. 
a. With the post-acetabular ilia more or less widely separated in the mid- 
dorsal line; a more or less well-developed supra-trochanteric process. 
a’. Post-acetabular ilia separated by the intervention of the synsacral neural 
spines; ischia bowed inwards towards the middle line, and fused 
posteriorly with the ilium; perforation of inner wall of acetabulum 
constricted by ossification. 
a’. Post-acetabular Jonger than pre-acetabular ilium, and tapering 
gently . 
. Post-acetabular shorter haa pr-satabulr itu anid archbd 
dorsally 
Dromeus. 
cine aaa sk : See POE Mle Casuarius. 
b’. Post-acetabular ilia widely separated By means of transverse processes, 
leaving neural spines in middle of a deep fossa roofed in late in life by 
a sheet of bone; ischia widely separated one from another and from 
post-ilia ; post-acetabular with a very wide dorsal plane. 
ce’, Median fossa dividing post-acetabular ilia only imperfectly roofed 
in, leaving a more or less extensive cleft on either side of a broad, 
flat neural plate ae ae Dinornithide. 
d’’, Median fossa dividing post- aéetgbulak Hee eounplelaly ebofad iy boas) 
but perforated by a double row of foramina, one on either side of 
the median line . oo oo) crue Aupyornts. 
» The pelvic arch of the Crypturi will be found described on p. 263. There was no need to include it 
here. 
