118 MB. C. W. ANDBBWS ON EE3IAIN8 OP ^PYOENIS [Feb. 6, 



articular region, though the shaft presents considerable differences. 

 These are : — 



(1) The flattening of the lower part of the anterior surface is 



less marked. 



(2) Above the flattened region the shaft contracts somewhat 



suddenly in width, becoming at the same time oval in 

 section. 



(3) The groove for the extensor tendons of the digits is some- 



what deeper than in ^E. maximus, the ridge on its outer 

 side being more strongly developed, while its inner border 

 rises into an elongated blunt tuberosity, 2-5 cm. in length 

 from above downwards, its lower end being about 3 cm. 

 above the inner condyle. 



(4) Judging from various fragments, the whole tibio-tarsus 



appears to have been of much more slender proportions 

 than in the larger forms ; it probably measured about 50 cm. 

 in length l , or rather more than the tibio-tarsus of JE. Jiilde- 

 brandti, the other dimensions of which are considerably 

 greater than the corresponding ones of this bone. 



The other chief measurements are : — 



cm. 



Width of distal end 75 



Diameter of shaft from side to side at narrowest 



point 3*2 



Circumference at the same point 8*7 



The most nearly complete specimen of the smaller femora 

 unfortunately wants the entire trochanter and inner condyle, 

 while the head and outer condyle are much abraded. From the 

 upper surface of the head to the lower end of the outer condyle, 

 measured along a line parallel to the long axis of the bone, the 

 length is 24 - 5 cm. ; a similar measurement of the femur of &. titan 

 gives 40 cm. The circumference of the shaft at the narrowest 

 point is 13 cm., while that of the femur on which JE. modestus is 

 founded is given by Milne-Edwards as 12 cm. ; two other femora 

 in this collection measure 11*5 and 12 cm. 



The bone is much compressed from before backwards, and the 

 upper portion of the anterior face is very flat. The popliteal fossa 

 is shallow and its borders less strongly defined than in the larger 

 forms. 



The wall of the bone is compact and thin, but, unlike the larger 

 femora, the cavity is large, since the bony reticulum is little 

 developed. 



In the collection from Itampulu-Ye there are several nearly 

 complete vertebra belonging to a large and a small species. The 

 smaller vertebrae include a nearly complete cervical, a cervico-dorsal, 

 and two dorsals. 



1 The actual length of the tibia of MttUeromis agilis is 44 cin. 



