328 
DR. R. W. SHUFELDT’s MORPHOLOGICAL 
are about opposite the acetabulse ; those in front and behind 
these are proportionately graduated off ; and although, as I have 
observed, no foramina exist among them, the overspanning bone 
is in some places exceedingly thin. 
The anterior margins of the ilia are obliquely truncate from a 
direction within outwards and backwards ; and these borders 
have a delicately thickened rim. Internally, the margins of 
these bones fail, on either side, to meet the consolidated neural 
crest of the leading sacral vertebrae, there being short “ilio- 
neural canals ” present in the pelves of these Trogons, of some 
two millimetres in width. 
As to the superficial form of the several areas of this pelvic 
roof, we find the anterior moieties of the ilia to be concave ; 
the posterior and smaller ones convex ; and the middle area, 
formed by the sacrum, is an ample lozenge in its general 
outline. 
Turning now to the lateral aspect of the pelvis of this Trogon 
(PI. XIX. fig. 13), we are to observe that the anterior or pre- 
acetabular division of the bone lies in the same general plane 
with the longitudinal axis of the dorsal vertebrae, while there is a 
gradually increasing droop of all the hinder division of the bone, 
until we arrive at the slender post-pubic element, the posterior 
extremity of which turns slightly inwards and upwards. 
Comparatively speaking, the acetabulum is rather small, and 
its base is deficient in bone, being so rendered by the usual 
circular vacuity there. The anti trochanter occupies here its 
common site, above the acetabulum, and faces forwards, down- 
wards, and a little outwards. Behind it again we find an ample 
and subelliptical ischiadic foramen, situated thoroughly within 
the borders of the sui’rouuding bone. The obturator space and 
the obturator foramen have so merged with each other that 
scarcely a distinguishing trace of separation can be detected 
between them. 
A long subelliptical foramen is thus formed, the lower margin 
of which is bounded, as usual, by the narrow bar of the post- 
pubic element, as it sweeps by to the rear. This foramen is 
closed in behind by the foot-like process of the ischium which 
descends to meet the post-pubis, the latter extending for some 
three or four millimetres behind it, and thereafter taking a 
direction already described in a foregoing paragraph. 
On the underside of this pelvis we find its “ basin ” to be 
