168 DR. C. W. ANDREWS ON FOSSIL BIRDS [Jail. 19, 



As already mentioned at the beginning of this paper, these 

 specimens throw no light on the relationships and oi-igin of the 

 ^pyoiiiithes, and it seems that in Madagascar we have a gi'oup 

 of closely inteii-elated Ratites, vaiying enormously in size and in 

 the degree of pachyostosis attained, but otherwise pi'esenting few 

 differences of importance, just as in New Zealand all degrees of 

 size and massiveness exist between Dinornis parmts and D. maxi- 

 imts or Pachyornis ele2)hant02nis. In Madagascar, so far as known 

 at present, the extremes ai-e Mullerornis agilis and jEpyornis 

 titan. 



The dimensions of the limb-bones described are given below ; 

 those of the pelvis have already been noticed. 



Femur : cm. 



Length 235 



Width of the proximal end 8-4 



Antero-posterior diameter of the shaft 2'9 



Lateral diaineter of the shaft 3 ■ 5 



Width of the distal end 3-7 



Tibia: 



Length to top of articidation 40 '5 



Length to top of cnemial crest 43*5 



Width of the proximal end 6'2 



Width of the middle of shaft " 2-8 



Width of distal end 6-2 



Antero-postei"ior diameter of the shaft 2*0 



Fibula : 



Length upwards of 1 6'0 



Antero-posterior width of proximal end 3"4 



Lateral width of proximal end 1 '6 



Metatarsus : 



Length 27-3 



Width of the proximal end 6'6 



Width of shaft at narrowest 2"7 



Width of the distal end G-5 



Width of the middle trochlea 2-5 



Note on a new Ratite Bird [Ere7nopezns eocamtis, gen. et sp. nov.) 

 from the Upper Eocene of the Fayum District, Egypt. 



(Text-figure 15.) 



One of the most interesting specimens collected from the Upper 

 Eocene beds of the Fayum in 1902 is the distal end of the left 

 tibio-tarsus of a large ratite bird. The fragment consists of the 

 articulation and four or five centimetres of the shaft, and, except 

 for a slight abrasion of the inner condyle, is in a sufficiently good 

 state of preservation for it to be possible to observe all the 

 important points in the structure of this highly characteristic 

 portion of the skeleton. In fact, although of course much more 



