22 Observations Upon the Morphology of 
Careful count assures me that there are fifteen vertebree 
included in the consolidated pelvic sacrum, of which the 
first four throw out their diapophyses to abut against 
the nether surface of the ilium upon either side. In 
both of my specimens the propubis is very large, while the 
postpusisis long and slender, scarcely touching the lower 
margin of the ischium for its entire length. It projects 
‘about a centimetre beyond the latter bone posteriorly, and 
shows but a slight tendency to enlarge at this end. The 
ischiadic foramen is broadly rounded anteriorly, gradually 
sloping in outline to a point behind ; this is also the form 
of the opening on the right side in my female specimen, 
but strange to say, on the left side of the bone there, the 
aperture is nearly of a circular outline. The inner margins 
of the post-acetabular portions of the ilia are but placed in 
close approximation with the corresponding borders of the 
sacrum, with which latter they do not anchylose, while 
anteriorly these juxtaposed margins are completely fused 
together. Strongest among the braces afforded by the 
transverse processes of the vertebree of the pelvic sacrum 
to the ilia on either hand, are the diapophyses of the first, 
fourth and tenth, and these seem to be somewhat modified 
to meet this very end (Fig. 14). Gallinaceous birds as a 
rule all have a capacious pelvic basin, and the jungle fowl 
before us affords no special exception to it, for the con- 
cavity here is both deep and wide, making ample room for 
the organs and viscera it protects during life. 
Stix vertebre are to be found in the skeleton of the tail 
of Gallus bankiva, to which is to be added a curiously 
formed pygostyle. My male specimen has all six of these 
caudal vertebre free, whereas in the skeleton of the 
female, the anterior one has fused with the ultimate 
urosacral. We must believe that Darwin made a slip in 
hig count, when he reckoned ‘‘seven” caudals for this 
form, for were that so, and he seems to have included the 
last sacral in his number, he could not but have claimed 
fourteen for the pelvic sacrum, whereas, as he rightly 
records, there are fifteen. Strictly speaking, G. bankiva 
has four dorso-lumbar vertebra, five sacrals, and s?a uro- 
