82 BULLETIN : MUSEUM OF COMPARATIVE ZOOLOGY. 



processes are expanded at the free end. In the specimens of curassows 

 available for comparison the external xiphoid is not pedate, but there is 

 a suggestion of this condition in Talegallus. The sternal clefts are 

 typically cracine, there being no approach to the deep internal cleft 

 which makes the external and internal xiphoids of galline birds really 

 branches of one process. The keel of the sternum is produced more 

 anteriorly than in other Galliformes, though nearly approached by 

 Centrocercus. It is to be noted that in this latter form the furcula is 

 unusually long and narrow. 



Fore-limh. — The humerus, like the other bones of the wing, is stout 

 and has the deltoid process well developed. The crushing which the 

 bone has undergone prevents its being definitely stated whether or not 

 the humerus was pneumatic, although the probabilities are that it was 

 not. The structure of the wing, in conjunction with that of the sternum, 

 indicates a bird of good powers of flight. The other bones of the wing 

 lie so nearly over one another and are so flattened together that little can 

 be said as to their details, save that the thii'd metacarpal appears to 

 have been much straighter than is usual among gallinaceous birds. 



Pelvic Girdle. — As the pelvis lies on its dorsal surface it cannot be 

 stated whether or not it was curved or straight in profile, but in the 

 subequal proportions of the pre- and post-acetabular portions it resembles 

 the curassows, although the conditions are much the same in Meleagris. 

 It is somewhat wider in comparison with its length than in the curas- 

 sows, the proportions resembling those observed in Thaumalea. There 

 is no tendency toward separation of the ilia and ischia. The ischia do not 

 seem to be bulged out to overhang the pubes as they do in Ortalis, but 

 this feature is so extremely variable in the Galliformes as to have little 

 or no significance. The pubes are long and slender, and as the speci- 

 men now lies, they appear parallel with one another througliout their 

 distal halves. In most Galliformes the pubes approach each other 

 distally, sometimes, as in Ortalis and Penelope, being almost in contact. 

 In this respect the Green River specimen departs from the cracine type 

 and approaches such forms as Meleagris and Rollulus, and while it is of 

 course possible that the pubes may have approached each other in the 

 living bird, the intervening space is now so great as to make this seem 

 doubtful. The prepubis is small, the obturator foramen very small, and 

 the ilio-ischiadic space moderate. 



Hind-limb. — The femur is so crushed as to obscure its characters. 

 There is no sign of a patella, though this may have been present. The 

 cnemial ridges are slight, and thoro is the customary osseous tendinal 



