1870. ] HULKE—KIMMERIDGE PLESIOSAURIAN REMAINS, 611 
3. Note on some PLEstosauRIAN Rematns obtained by J. C. Manset, 
Ksq., F.G.S., an Kiwmertper Bay, Dorser. By J. W. Huxxe, 
Ksq., F.R.S., F'.G.S. 
(Puatz XLI.) 
THEsE remains form part of the rich series of Enaliosaurian fossils 
obtained from Kimmeridge Bay, by J. C. Mansel, Esq., to whose 
courtesy I am indebted for the opportunity of bringing them under 
your notice. They consist of five vertebra, four of which are 
nearly entire, with pieces of several ribs, a digital phalanx, and a 
carpal bone (?), imbedded in two slabs of clay-stone, indicating an 
undescribed species of Plestosawrus,—and of a large number of 
associated bones representing another species characterized more 
particularly by the proportions and peculiar construction of its pad- 
dles, which sharply separate it from the typical Plestosauri of the 
Lias, and show an extremely close affinity with Pliosaurus. 
PLESIOSAURUS BRACHISTOSPONDYLUS (PI. XLI. figs. 7-9). 
The middle dorsal vertebrae (the only ones in Mr. Mansel’s collec- 
tion) of the species for which I propose this name, are characterized 
by the extreme shortness of the centrum, which in three of the ver- 
tebre lying in one slab has a length, or antero-posterior diameter, 
of 1 inch only, measured along the outer, non-articular surface. 
The length of the fourth centrum, in the other slab, is -3 inch more; 
but this centrum is a little obliquely distorted by pressure. The 
breadths (or horizontal transverse diameters) of the centra are re- 
spectively 4:6, 4:5, 4:3, 4-4 inches; and their heights (or vertical 
diameters) are 4, 4, 3-8 inches. 
Length. Height. Breadth. 
Centrum. inch. inches. inches. 
No. 1. 1 4 4-6 
No. 2. 1 4-5 
No. 3. 1 4 4-3 
No. 4. 1:3 3°8 4-4. 
: . 2. 
Length of transverse process { ie a ae i af 
Span between ends of transverse processes 6-7 inches. 
Height of neural spine about 3:6 inches. 
Height of entire vertebra from lower border of centrum to top of 
neural spine about 9:4 inches. 
These centra are therefore about four and a half times as 
broad, and nearly four times as high as they are long—proportions 
which I have not found in any other Plescosaurus. ‘The articular 
faces are gently swollen near the circumference, and hollow at the 
middle, where the distance between the two faces in one centrum 
measures ‘7 inch. These proportions and the hollow articular faces 
