PROFESSOR FLOWER ON RISSO’S DOLPHIN. Us 
In height they gradually increase from 2 inches (first) to 2°4 inches (nineteenth); in 
breadth they increase from 2°3 inches (first) to 2°4 inches (nineteenth) at the articular 
ends. The sixth, seventh, and eighth have the highest spines, viz. 6:4 inches from the 
upper surface of the body of the vertebra to the tip of the spine—the height of the first 
being 6 inches, that of the last 4°3 inches. The spines are long, slender, upright, and 
devoid of metapophyses. ‘The transverse processes gradually diminish from the first 
(where the breadth of the vertebra between the tips of the processes is 11-2 inches) to 
the last (where the same measurement is but 7-5 inches); they are very nearly equal in 
antero-posterior breadth throughout, viz. 0°9 of an inch; and they arise from rather 
nearer the front than the hinder end of the body; but this is less marked in the pos- 
terior than in the anterior portion of the series. 
I have, as usual, reckoned as the first caudal vertebra that which bears at the hinder 
end of its body the first chevron bone. The bodies of these increase in length from the 
first (which is 1-4 inch) to the sixteenth and seventeenth (which are 2 inches), after which 
they again diminish. In height they do not differ greatly, until beyond the eighteenth, 
when they rapidly decrease. ‘They begin to diminish in breadth after the eleventh. 
The lateral compression characteristic of this part of the vertebral column of Cetacea 
continues until the twentieth vertebra; the twenty-second is the first of the series of 
broad, depressed, terminal vertebra, the twenty-first being of transitional form. The 
spinal canal ceases at the nineteenth caudal vertebra. The transverse process is reduced 
to a low ridge on the fourteenth, and disappears altogether on the fifteenth. The 
vertical vascular canals first appear in the middle of the base of the transverse process 
of the fifth, though small, and on the right side only; on the sixth they are present on 
both sides, and they continue as far as the penultimate vertebra. ‘The terminal vertebra 
is a small, triangular nodule, very inferior in width to that which precedes it. 
The chevron bones present are twenty in number, all having the two lateral halves 
united. It is not improbable that some additional ones from the hinder end of the series 
may have been lost in macerating the skeleton. The first two are small, with no spines 
developed beyond the union of the lamine. ‘The third shows a sudden increase in 
length, which augments in each succeeding one until the seventh, after which they 
diminish in length, but are more expanded in the antero-posterior direction. 
There are twelve pairs of vertebral ribs, all of which, except the first three or four, 
are very slender. The anterior six pairs have long necks, reaching in each case to the 
articular surface on the side of the vertebra in front of that to which the tubercle is 
attached. The seventh presents, on both sides, a peculiar arrangement. ‘The rib is not 
developed inwards beyond the tubercle, which articulates (as do all the posterior ribs) 
with the end of the transverse process of the corresponding vertebra; but, detached from 
the rib, and fused with the under surface of the transverse process of the vertebra, is a 
strong spiculum of bone 1:4 inch long, with its free end pointing forwards, downwards, 
and inwards, and reaching to within half an inch of the before-mentioned tubercle on 
