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Proceedings of Royal Society of Edinhurgh. [sess. 
standing the length of the ovary, there can be no doubt from the 
size of the trumpet-shaped mouth of the tube, and from the remark- 
able arrangement of the fimbriae, that the ovary could be completely 
embraced by them ; whilst the longitudinal arrangement of the folds 
would direct the ovum, after its escape from the ovary, into the tube 
and cornu of the uterus. Projecting from the surface of the right 
ovary was a swelling about the size of a small walnut, which on being 
cut into was seen to be due to a corpus luteum. About 1 inch from 
it was a second and smaller swelling about the size of an almond, 
which on section was seen to contain a much-shrivelled corpus 
luteum obviously on the point of disappearing. From the presence of 
the large corpus luteum on the right ovary, from the size of the 
cavities of the cornua, and the somewhat flaccid and dilated condition 
of the uterine cavities generally, I was led to think that the animal 
had been pregnant at a recent period. No trace of foetal membranes 
was, however, to^be seen in the uterine cavity j nor could I recognise 
with a simple lens an arrangement of recesses or crypts on the free 
surface of the mucous lining such as I described a number of years 
ago both in Orca gladiator"^ and in the Narwhaht On making vertical 
sections through the mucous membrane, and examining them with 
the compound microscope, distinct evidence was obtained of the 
presence both of a glandular layer in the mucosa and of a more 
or less defined layer between the divided gland tubes and the 
free surface. In this more superficial layer depressions were seen 
irregular in shape and arrangement, which seemed as if they were 
crypts or recesses in process of disintegration, in which the villi 
growing from the surface of the chorion might at one time have 
been lodged. The microscopic examination strengthened the opinion 
I had formed on the general grounds above referred to, that the 
animal had been recently delivered of a young one, and that the 
uterus was in process of involution. 
Heart . — The Heart, as is usual in the Cetacea, was wide in its 
transverse and short in its antero-posterior diameter. Its greatest 
width at the base of the ventricles was 20 inches, but antero- 
posteriorly it measured only 12 inches. The apex of the heart was 
* Trans. Boy. Soc. Edin., vol. xxvi., April 1871. 
t Proc. Boy. Soc. Edin., 1876. 
