CONDYLAETHEA. 503 



Measurements of humerus. 



Length of hmmerus 092 



e anteroposterior (greatest) 024 



Diameters proximally < transverse 5 ''* bicipital groove 015 



V (at lesser tuberosity 019 



Diameters of shaft at middle ^^"t^^P''^'^"'" ^^^^ 



( transverse 007 



Width at epicondyles 023 



Width of condyles distally 015 



/ externally 010 



Anteropoaterior diameter of condyles < internally 013 



( at constriction 008 



The above described humerus is from the individual which furnished 

 the vertebrae. It inchides also femora, tibiae, and a calcaneum, which I 

 now describe. 



The femur is rather robust. The heads are unfortunately lost from the 

 specimen under consideration. The trochanters are evidently prominent. 

 The third trochanter commences above the inferior termination of the lesser 

 trochanter, and the base extends much below it. The patellar trochlea is 

 prominent; the external condyle is a little wider than the internal, and less 

 prominent. There is a fossa at its posterior base, while the inner has a 

 shallow one on the middle of its side. 



The tibia is a characteristic bone. It resembles considerably that of 

 Phenacodus, but differs in many points. First, the crest is not obliquely 

 truncate next the head, but is fully rounded. Second, it extends farther 

 doAvn the shaft, terminating rather abruptly a little above the middle of the 

 latter. Third, the ridge which is its continuation, twists abruptly to the 

 internal edge of the sliaft, leaving the anterior face flat, instead of continu- 

 ing down the middle of the front of the shaft, and turning a little outwards 

 below. Fourth, the early disappearance of the external posterior angle, 

 and its reappearance on the distal two-fifths of the length, and termination 

 in an angle of the astragalar surface. Fifth, the disappearance of the pos- 

 terior external angle on the middle of the length of the shaft. The posterior 

 face of the shaft on its distal half is roughened for muscular insertion. 

 ^ The roughened area naiTows upwards, and terminates in a narrow apex. 

 Sixth, the obliquely truncate internal malleolus, which is acuminate as in 



