428 DR MORRISON WATSON AND MR ALFRED H. YOUNG 
were in greater mass than those of either the upper or the lower tier. The 
convolutions of the two lower tiers reached the temporo-sphenoidal part of the 
hemisphere, while those of the upper tier did not extend so far down, but 
stopped at the occipital end of the cerebrum. The convolutionary arrangement, 
as above indicated, presented the closest similarity in both hemispheres.” 
Eye.—tThe eye is small, and is situated 9 inches behind the extremity of the 
muzzle. 
Ear.—According to WyMAN,* the external auditory opening is “ of a size 
sufficient to admit a bristle, and surrounded by a very slight elevation of the - 
integument.” According to Barciay,t no trace of an auditory opening is 
distinguishable. 
URINARY ORGANS. 
Kidney and Ureter.—The kidney has the form of an elongated flattened — 
cake, measuring 9 inches in length, with an average breadth of 34 inches. Its 
anterior extremity is rounded, whilst its posterior extremity is more pointed in 
form. The organ is enclosed in a stout fibrous capsule, upon opening which — 
the kidney is seen to be composed of a number of distinct and easily separable 
lobules. Each of these has an average diameter of one-fourth of an inch, 
and is polygonal in form, so that the adjacent lobules, when in situ, are 
accurately applied to one another, only a delicate prolongation of the external 
capsule intervening, and forming a complete investment to each of them. 
The lobules are over 400 in number. Each in itself forms a complete renal 
organ, and is provided with a separate duct. The ducts, uniting with one 
another, finally give rise to the ureter. The renal blood-vessels enter the kid- 
ney close to its anterior extremity, whilst the ureter, formed as above described, 
and presenting no trace of a dilated portion or pelvis, passes off from the pos- 
terior extremity of the organ. The ureter is wide, and its walls are thin. It 
enters the bladder a short distance behind the neck, after traversing obliquely 
the coats of the viscus. oo 
Bladder is small in size, and regularly pyriform. It measures 3 inches from 
base to apex. Its superior surface is entirely covered by peritoneum. 
Urethra measures 3 inches in length, and is closely attached to the lowe 
wall of the vagina. It opens into the vulva immediately behind the clitoris. 
The urinary organs of Beluga differ but little from those of other cetacea. As 
observed by GuLLiver,{t TurNER,§ and Murte|| in G'lobiocephalus, and by CARTE 
and MACALISTER | in Balenoptera rostrata, the renal vessels enter the kidney 
close to the anterior, whilst the ureter passes off from the posterior extremity of 
* TIL p. 610. + VIIL p. 394. + XXIUL p eome 
§ IX. p. 75. - || IL p. 284, q I. p. 251, 
