404 MR. W. H. FLOWER ON THE SKELETONS OF WHALES [Noyv. 8, 
surface, corresponding to those above described in the first vertebra. 
The neural arch is high and massive, and the spine well developed. 
The lateral processes are large wing-like plates, directed somewhat 
backwards, with a regularly oval perforation rather above the middle 
of their base. The dimensions are given in the figure, which is drawn 
to scale, regardless of perspective. 
The third, fourth, and fifth vertebree much resemble each other ; 
they have rounded oblong bodies, high triangular neural canals, 
spines gradually increasing in length, and well-developed upper and 
lower transverse processes completely united together at the ends, 
leaving large oval spaces between them. In the sixth the transverse 
processes do not meet by the space of 3 inches; and I doubt if they 
ever would meet in the process of growth, on account of the different 
planes of their ends. The upper one is long, with its flat surface 
almost vertical ; the lower one, short and broad, with a stout conical 
tuberosity projecting forwards and downwards from its base, turns 
so completely on itself that its broad terminal end is directed hori- 
zontally ; it is, moreover, very nearly complete. The peculiar form 
of this process is highly characteristic of all the specimens I have 
examined of the genus Siddaldius, though it is best marked in the 
one under consideration, being the most mature. It should be men- 
tioned that, when the series is placed together, a gradual approach 
to its form is seen in the lower processes of the antecedent vertebrz. 
The seventh cervical vertebra has no trace of an inferior transverse 
process. The thicknesses of the under surface of the bodies of the 
five last cervical vertebre, and of the two first dorsal (without the epi- 
physes), are respectively 1:5, 1°3, 1°4, 1°5, 2, 2°25, and 2-5 inches. 
The width of the first dorsal vertebra across the transverse processes 
is exactly the same as that of the last cervical, 23’; the second is 3" 
less. The transverse processes of the posterior dorsal and of the 
lumbar vertebree are very broad in the antero-posterior direction, 
and the spines are high. In the second lumbar vertebra, which is 
the largest, the extreme width is 40", and the height 29". 
The ribs generally are slender, the first much shorter, broader, 
and flatter than any of the others. The vertebral end of this is 
split to the depth of about 6" into two flat broad plates, of which 
the anterior is slightly the longest; this brings their articular sur- 
faces, when the rib is placed in its natural position (7. e. somewhat 
sloping backwards), exactly on a level, and proves that they must 
have articulated with the equal transverse processes of the seventh 
cervical and first dorsal vertebree, and not with those of the latter 
and the second dorsal vertebra, which is 13 inch shorter. This rib 
is 323" in length in a straight line, 43/" wide at the middle, and 8" 
at the lower end; in thickness at the middle it is 1/2. Its general 
form closely resembles the figure given by Dr. Gray (P. Z. 8. 1864, 
p- 224) from a specimen in the Museum of the Royal College of 
Surgeons, but it is rather broader in proportion to the length. The 
second, third, and fourth ribs have large articular heads and only 
slightly produced capitular processes. The second rib is 45! in 
length, the third 60", the fourth 61", the fifth 623", the sixth 613", 
the seventh 612", the ninth 57”, the twelfth 51", the thirteenth 
