350 Traasactloiis. — Gtologij. 



Dimensions. 



Inches. 



Height of cen tini in ... ... ... ... 5 



Tnir.svei'Se diameter of ceutrum .. ... ... O'O 



Length of ceiitru 111 ... ... ... ... 4-2 



Pnazygapophysis ... ... ... ... 1"3 



Diapophi/ais — length . . ... ... ... 4'5 



,, width at base ... ... ... 1-6 



,, articuhir facet ... ... ... 2 



No. 8 b. — This specimen, ah-eady referred to, also has two similar vertebrse, 

 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. 



No. Sd. — A paddle, also from the Amuri Bluff, the only divergence from 

 the foregoing chai-acter being in the form of the ulna, which is decidedly moi-e 

 Plesiosauroid. 



No. 8 e. — Four vertebrae, having the characters of the foregoing, b\it 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/. — This is a lai'ge slab, which measures 4 feet in length, containing 

 vertebrae which I refer to this species, showing that the neck had enoi'raous 

 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 vertebrae 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 vertebrae have the ventral surface reversed in 

 relation to the others. The four posterior vertebrae have hatched-shaped 

 transverse processes. They resemble the description of the cervical vertebn^j 

 of Elasviosaurus, but present a marked difference in having the width of the 

 centrum greater than its height, while the pi-oj)ortional length of the centra, 

 and the large, firmly-anchylosed neural arches separate it from Flesiosaurus. 



No, 8 g. — Several dorsal vertebrae 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. 



