240 FIELD COLUMBIAN MUSEUM. 
way between the deltoid crest and 
the great tuberosity is a second 
rugose surface evidently for the inser- 
tion of other shoulder muscles. The 
ectepicondylar ridge is entirely lost, 
owing to the weathering to which the 
distal end has been subjected. The 
direction of the bone fibres on the 
lateral margin indicates that it may 
have been quite prominent. All 
traces of rugosity have likewise dis- 
appeared from the distal end, in- 
dicating that the humerus was prob- 
ably some inches longer than it now 
stands. ; ; 
The coracoid is a larger, but less 
massive, bone than that of Apato- 
saurus, (Fig. 4, Plate LXXV.) It 
is elongate antero-posteriorly, rounded 
on its inferior margin, and straight 
at the scapular articulation. The 
glenoid articular surface is directed 
outward as well as backward, a 
feature observed in no other opis- 
thocoelian genus. The postero-inferior 
surface is thick and rugose for epico- ' 
racoidal attachment near the glenoid 
cavity, from which it is separated by 
a narrow notch only. The posterior 
border becomes gradually thinner, and 
its rugose character disappears mid- 
way between the glenoid cavity and 
the anterior scapular angle. The 
emargination noticeable in the specti- 
men at this point is due to crushing 

Fig. r. Posterior view of right . 
humerus of Brachiosaurus altithorax, from contact with the head of the 
1-natural size. ; ‘ 
ve humerus while in the matrix. 
The femur is well preserved, though somewhat compressed antero- 
- posteriorly. (Figs. 1 and 2, Plate LX XIV.) Regardless of its great 
length, this bone is almost as stout in the shaft as that of A pato- 
saurus, though the articular ends are proportionally less expanded. 
The lateral surface of the shaft has a prominent convexity one-fourth 
