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DE. E. W. SHUFELDT's MOEPHOLOGHCAL 



are about opposite tlie 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 ; aud these borders 

 have a delicately thickened rim. Internally, the margins of 

 tliese bones fail, on either side, to meet the consolidated neural 

 crest of the leading sacral vertebrse, 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 j)lane 

 with the longitudinal axis of the dorsal vertebrse, 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 antitrochanter 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 surrounding 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 



