350 : T'ransactions.—Geology. 
DIMENSIONS, 
Inches. 
Height of centrum AS 5 
Transverse diameter of centrum 5:5 
Length of centrum Ri 4:2 
Præzygapophysis SEN 18 
iapophysis—length у 45 
5 width at base 1:6 
articular facet 2 
No. 8 b. —This specimen, already referred to, also has two similar vertebræ, 
but less perfectly preserved, the dimensions agreeing exactly, so far as can be 
ascertained. 
A centrum of a similar vertebra was found with the paddles at the 
Cheviot Hills, but as its length is one-fourth less, and the other dimensions 
are proportionately small, the Cheviot Hills specimen, notwithstanding its vast 
size, must have been greatly surpassed by those from the Amuri. ü 
No. 8d.—A paddle, also from the Amuri Bluff, the only divergence from 
the foregoing character being in the form of the ulna, which is decidedly more 
Plesiosauroid. 
No. 8 e.—Four vertebre, having the characters of the foregoing, but of 
smaller diameter, and without the long lateral processes ; are, probably, from 
the anterior dorsal or cervical region of an individual of this species. 
No. 8 f—This is a large slab, which measures 4 feet in length, containing 
vertebre which I refer to this species, showing that the neck had enormous 
proportions, the transverse diameter of the centrum being 4 inches, vertical 
3 inches, and the length 3:5 inches. The neural spines are immensely 
elongated and closely interlocked, having a height of 5 inches, and a width of 
2-7 inches. "Thirteen vertebre have been preserved in a continuous series, 
having a length of 3 feet 6 inches. The neck has been curiously twisted, 
so that the anterior four vertebra have the ventral surface reversed in 
relation to the others. The four posterior vertebre have hatched-shaped 
transverse processes. They resemble the description of the cervical vertebree 
of Hlasmosaurus, but present a marked difference in having the width of the 
centrum greater than its height, while the proportional length of the centra, 
and the large, firmly-anchylosed neural arches separate it from Plesiosawrus. 
No. 8 g.—Several dorsal vertebræ belonging to this species are in the 
Canterbury Museum. : 
9. MAUISAURUS LATIBRACHIALIS, n. sp. 
No. 9 a.—This specimen, obtained at the Amuri Bluff by Dr. Haast, is the 
proximal portion of a humerus of much larger size, and differs in its proportions 
from any of the foregoing, the width through the tuberosity being as 7 to 4, 
and also, at the same time, being so much compressed as to indicate a decided 
specific difference, 
