STEREORNITHES 



907 



In a smaller species, P. infatus, of which more remains than of any 

 other have been recovered, the entire head measures 340 mm., or 

 nearly 13 "5 in. The tarso-metatarsus of what Dr. Ameghino considers 

 to be a species of intermediate size, P. sehuensis, is about 14"25 in. 

 long and 3 in. wide ; and he figures an example of the tibio-tarsus 

 of F. injlatus which he says is 400 mm., or say 15 "75 in. in length. 

 The femur measures 230 

 mm., or about 9 in. 



In Brontornis the 

 mandibular symphysis is 

 shorter, wider and more 

 sharply curved upward 

 at the tip, while the 

 rami are more divergent, 

 their approximate length 

 being 5 '5 in., and maxi- 

 mum width 4 inches. 

 The tarso-metatarse in 

 this genus is relatively 

 shorter and stouter than 

 in Phorm'hacos, having a 

 length of about 15*5 in., 

 and a maximum distal 

 width of 0-25 in. The 

 associated tibio-tarsus of 

 Bronfornis, mesiSUTes 30 "5 

 in. and the former 15 5 

 in. The species, B. 

 burmeisteri, therefore at- 

 tained a stature approxi- 

 mately equal to that 

 assigned to jEpyornis 

 maximus. 



On the remaining 

 members of this Family 

 and of Opidhodachjlus 

 there is no need now 



Phorokhacos intlattts. 



fl, coracoid ; 6, proximal end of scapula ; c, distal end of 

 humerus; d, ulna; e, metacarpus. (After F. Ameghino.) 



to dwell, for the remains discovered are 

 insufficient to admit of their being considered to any useful purpose. 

 With regard to the general affinities of the Stereornithes it is 

 impossible to say much at present ; but more than one Avriter has 

 remarked on the resemblance in several points offered to Gastm'nis 

 of the European Lower Eocene, the tibio-tarsus of the latter having a 

 distal bridge and a deep intercondylar furrow, while its tarso-meta- 

 tarsus has a prominent intercotylar tuberosity, and the relative length 

 of the distal trochlese is similar. It is true that the distal end of the 

 tibio-tarsus is inflected in the European genus ; but the example of 



