PELVIC ARCH OF HESPERORXIS. 



The following fig-tires represent the pelvic bones of two recent birds, 

 the Erneii and Grebe, which, in this part of the skeleton, also, repeat some 

 of the characters seen in Hesperomis. 



Figure 16. — Pelvis of Emeu (Drommus Nbvw Holland-its, Latham); side view; one-fifth natural 



Figube 17. — Pelvis of Grebe (Podiceps occidenialis, Lawrence); side view; natural size. 



Figube 18. — The same pelvis (Podiceps occidentalis, Lawrence); seen from above. 



The signification of the letters is the same in all the above figures, viz: o. acetabulum; /. ilio-sciatic 

 foramen; il. ilium; is. ischium; p. pubis; p'. post-pubis 



