'82 



MB. C. AV. A]S(DKEWS ON A jS^EW BIRD 



[June 20, 



its widest point being at the antitrochanters (a.t.). The pelvic 

 escutcheon narrows somewhat towards its posterior end ; in its 

 middle line the neural spines of the sacral vertebras form a slight 

 ridge, on either side of which there are some traces of interosseous 

 foramina, at least posteriorly, but these openings are not developed 

 to anything like the degree seen in Plialncrocorax or Plotus. The 

 line of junction of the postacetabiilar portion of the ilium with 

 the synsacrum can be seen. Above the ischiadic foramen the iha 

 are very narrow and couAex from side to side. 



Fig. 2. 



Pelvis of Fro-phaethon shrubsolei ; partly restored from the opposite side. 

 Natural size. 



acet., acetabulum; a.t., antitrochanter ; i.f., ischiadic foramen; il., ilium; 

 is., ischium ; o.n., obturator notch ; 'pio., pubis ; s., sacrum. 



Theischia (rs.) consist anteriorly of a narrow bar convex externally; 

 posteriorly they become greatly expanded and fuse with the ilia, 

 closing a large ischiadic foramen (tig. 2, i.f.), the shape of which is 

 an irregular oval. The posterior angles of the ischia are broken 

 away, but they seem to have extended backward and downward as 

 in Sula. 



Of the pubes {pu.) only the proximal portion of that of the left 

 side is preserved. The obturator notch (fig. 2, o.n.) remained open 

 posteriorly, but there are indications of a blunt process on the 

 ischium which at least partly closes it. 



Beneath and in front of the acetabulum, on the right side, there 

 is a prominent knob of bone, w^hich was at first mistaken for the 

 pectineal process, but which is actually merely a fragment of bone, 

 probably of the femur. 



There are remains of two or three ribs (r.), two of which emerge 

 from beneath the ilia and probably articulated m ith the anterior 

 syu sacral vertebrae. 



The left femur (/.), lying in nearly its natural position with regard 

 to the pelvis, is fairly well preserved except at its distal end. 

 Unfortunately only its outer surface is visible, so that it supplies 



