Shi'it.i.dt : OsrK(;iA)i.v <>i iii!-. I Ikrodiones. 221 



ing progressively larger as we pass backwards. A few scattering ones 

 occur to the outer side, on either hand. The lateral postero-ex- 

 ternal portions of the ilio-ischiac bones extend backwards for a distance 

 considerably to the rear of the pelvic sacrum. On side view, at the 

 extremity of these i)arts, on either aspect, there is seen a well-marked 

 ilio-ischiadic triangular notch. This character also exists in the true 

 Ibises. The ilio-ischiac foramen is large and subelliptical in outline. 

 A pubic style is thickish, of nearly uniform calibre, projects behind 

 considerably beyond the rest of the pelvis, and is notably separated 

 from the lower margin of the ischium for its entire length. This 

 latter circumstance leaves the large obturator foramen very open at its 

 hinder boundary. A cotyloid cavity is also large, and its inner pe- 

 riphery is decidedly smaller than its outer one. Nothing of special 

 note characterizes the anti-trochanter. The latter is overarched by 

 the iliac border, above. Viewed upon its ventral aspect, the pelvic 

 basin is seen to be deep and capacious, and the sacrum made up of 15 

 vertebrae. Of these, the four anterior ones throw out their lateral 

 ])rocesses to fuse with the under surfaces of the ilia. The fifth one 

 just barely misses performing the same feat. In the next succeeding 

 four the processes, or such of them as are not aborted, are extended 

 directly upwards so as to be practically out of view. The tt'////i sacral 

 vertebra throws out powerful lateral struts to the iliac sides, just pos- 

 terior to the acetabulae. Either one of these are expanded at the ex- 

 tremity. This is also done by the eleventh vertebra, but in its case 

 they are shorter and very much weaker. Still more is this the state of 

 these processes in the last four sacral vertebrse. As I have already said, 

 the skeleton of the tail of this specimen has been lost, all to the first 

 segment. It resembles the ultimate sacral one, but is smaller ; it is 

 apparently pneumatic. Its low neural spine is thick and it has no 

 haemal one. Most of the foramina for the exit of the nerves of the 

 sacral plexus, on either side, are double — -one occurring immediately 

 above the other. 



Passing to the consideration of the sternum, we find its body to be 

 oblong in outline ; roundly and deeply concaved on its thoracic 

 aspect, where it is riddled with minute and scattered pneumatic fora- 

 mina ; and it is seen to be once well-notched upon either side of the 

 keel behind. The lateral xiphoidal processes thus formed are slightly 

 longer than the body, and directed posteriorly. The mid-xiphoidal 

 projection is rather broad and cut scjuarely across. A costal border, 



