810 MR. J. B. PERRIN ON BALENOPTERA ROSTRATA. [ Dec. 6, 
artery was given off, it underwent some increase in size, and became 
diminished again below the origin of the left subclavian. 
The diameter of the interior of the artery measured only an inch 
and a quarter, the remaining three quarters of an inch being occu- 
pied by the walls. 
The inferior wall of the aortic arch presented a remarkable in- 
crease in thickness from that of the rest of the tube, at the point 
opposite the orifice of the innominate artery, being fully half an inch 
in thickness. The thickness is obviously to prevent yielding at this 
part, which otherwise would be a weak point, and liable to aneurismal 
dilatation from the constant shocks which would be communicated to 
it by the pressure from the recoil of blood from the right aortic wall. 
The posterior wall of the arch of the aorta was traversed by nume- 
rous irregularly longitudinal strie, which extend as far as the origin 
of the left common carotid artery. From these strize it can be easily 
inferred that the aorta is subjected to considerable dilatation at each 
ventricular systole. 
The Lungs.—The left lung measured, in its long axis, 23 inches, 
the right 21 inches. The left lung weighed 64 lbs, the right 5 lbs. 
Both lungs were very much congested, especially the left one. 
Neither presented any lobular divisions. 
The trachea was remarkably short, but very wide and flattened. 
It gave off a small additional bronchus on the right side, to the 
the upper part of the right lung. 
Alimentary Canal.—The stomach consisted of four irregular ca- 
vities. The outward configuration of each varied considerably, espe- 
cially of the first and second. The former presented a fusiform 
shape, being much wider at the centre than at its apex and cesopha- 
geal extremities. It measured, when moderately distended with 
water, 22 inches in its long diameter, and 11 inches transversely at 
its widest part. The cesophagus entered the upper part of its dorsal 
aspect, the upper end projecting upwards beyond the point of junc- 
tion of the gullet, and formed a continuous fence or band with the 
second stomach. Below it tapered to a blunted point. 
The second stomach was cylindrical in shape, being directly con- 
tinuous at its anterior part with the first stomach, the two being 
united at an acute angle, and forming a V-shaped figure, the apex 
being directed upwards towards the diaphragm, and then the two di- 
verging away from each other, the latter, or second stomach, project- 
ing somewhat beyond the first, and presenting a more regular calibre 
throughout its entire length, terminating, however, below in a blunted 
and somewhat rounded point. It measured in its long diameter, from 
the angle of junction between it and the first stomach, 17 inches. 
The third stomach was smaller than either of the preceding, and 
directed more obliquely. It was attached to the middle of the right 
side of the second stomach, and presented an elliptical shape. It 
measured 13 inches in its long diameter. It was connected with the 
second stomach by a strong band of fascia, which passes between 
the adjacent sides of the second and third stomachs. 
The fourth stomach was directed more horizontally than the pre- 
