44 Proceedings of Royal Society of Edinhurgli. 
was 10 inches behind the vagina. Two inches on each side of the 
vagina was the mammary furrow, from which the end of the nipple 
projected ; about 2 inches external to this furrow was an antero- 
posterior accessory furrow in the skin about 8 inches long. The 
distance from the anal orifice to the mesial notch in the tail was 
7 feet 2 inches. 
Mouth and Baleen . — The baleen wreath projected downwards 
from the palatal mucous membrane to the dorsum of the tongue. 
Each half of the wreath consisted of rows of plates and bristles 
arranged transversely. In one half 287 rows were counted, in 
the other, 290. The outermost segment of each row was the large 
baleen plate ; the innermost was little more than a thick bristle. 
Between these two segments short, narrow plates were situated. 
At each end of the wreath the plates were also short, and so 
reduced in size as to be only thick bristles. In the middle of the 
wreath the plates of the outermost segment of each row were the 
largest, and measured 8J inches long by 3 inches in breadth at the 
base. Each of these plates was triangular, the base being attached 
to the palatal mucous membrane, the inner edge being fringed with 
bristles, and directed from above obliquely downwards and outwards; 
the outer edge being vertical, and with very few bristles projecting 
from it. The length of each half of the wreath was 3 feet 111- 
inches. The plates were all yellowish white, and the bristles project- 
ing from them were similar in colour. The collective series of plates 
and bristles in each wreath formed an inclined plane sloping from 
the roof of the mouth downwards and outwards, so that objects 
taken into the mouth would be collected in the interval between 
the opposite halves of the wreath, and be entangled by the bristles, 
whilst the water would filter outwards in the intervals between the 
rows of plates. Each half of the baleen wreath Avas curved, and 
at the anterior ends the short plates and bristles of the wreaths of 
opposite sides came close together immediately below the point 
of the beak, whilst posteriorly they began to curve inwards 
almost oj)posite the angle of the mouth, so as to be only a short 
distance asunder immediately above the passage into the pharynx. 
Nearer the middle of the roof of the mouth they were separated 
by a wide interval, which narrowed as it was traced forwards 
and backwards ; and in it the mucous membrane covering the 
