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346 Transactions.—Geology. 
the proximal end is slightly expanded, 2:5 inches in diameter, and presents 
two distinct regularly convex artieular surfaces. The distal extremity is 
compressed, but, unlike Plesiosawrus, the compression is at right angles to the 
greatest diameter of the other end of the bone, and is 4:5 inches in diameter, 
by 1 inch in width. The vertebral centrum is circular, with two very distinct 
inferior foramina. There are four articular facets, two on the upper and two 
on the lower quadrants, for the neural arch and the costal processes respectively. 
The artieular surfaces of the centrum are deeply excavated and concentrically 
striated, but with a well-marked central elevation and pit. The diameter of 
the centrum is 1:9 inches, its length 1-2 inches, and the thickness between the 
conical excavations of the articular facets is ^7 inch. 
No. 7 6.—This specimen is associated with the above on account of the 
double facet on the proximal end of the humerus, which is 10 inches long. 
The vertebr: included in this slab are proportionately larger but not so concave 
as in the type. They are from the posterior dorsal region, and measure 
2-5 inches in length by 3 inches in diameter. 
No. 7 ¢.—The occurrence of a vertebral centrum, having the character of 
this species, connects with it provisionally a fragment of a pelvic arch 
contained in another slab. It consists of a hatchet-shaped pubic bone of the 
right side, articulated to a portion of the corresponding bone of the left side 
by a symphysis 4 inches long. Where these bones unite they are thickened 
80 as to form a wide triangular surface of attachment. 
8. MAUISAURUS HAASTII, n. sp. 
The Sauropterygians referred to this genus are easily distinguished from 
Plesiosawrus by the character of the coracoid and the elongated vertebre. 
In the latter respect it approaches the genus Llasmosaurus of Cope, but 
differs from it in the scapular arch, and particularly in the powerful muscular 
attachments evidenced by the humerus, 
The huge reptilian distinguished by the above name is only represented in 
the collection by vertebræ, paddle bones, and coracoids, and a few rib fragments, 
of at least three individuals, obtained from the Cheviot Hills and the Amuri 
Bluff. No skull fragments or teeth have been found which can be referred to 
this animal, unless it be three teeth and a matrix cast of a portion of the jaw - 
of a specimen (87) obtained at Boby’s Creek, Waipara, by Mr W. T. L. 
Travers, and which is reported to be a fragment of the same block that was lost 
in the Matoaka, that contained the fine jaws and teeth described by Dr Haast,* 
* One of these teeth has been figured (PI. XXIV., G a, 0, с). Ithas a 
compressed, conical, slightly curved form ; the crown is of dense black enamel, 
with a slightly swollen ferruginous base that is obliquely truncate and 
* Haast, Trans, N.Z. Inst., IT., 186. 
