352 Transactions.— Geology. 
Both jaws are prolonged as blunt processes for 2 inches beyond the tooth 
series, and show no sign of terminal teeth. The height of the lower jaw at 
first tooth 15 2-5 inches, and at the tenth tooth 2:5 ; and the upper jaw appeared 
io maintain its width in the same remarkable way. 
No. 10 d.—A string of 10 lumbar vertebre, from the Waipara, appear also 
to belong to this genus. They are procolian and subprismatie in section. 
The neural spines are not well preserved, but were attached along the whole 
length of the vertebrz. The lateral processes (plewrapophyses) are short stout 
cylindrical tubercles, 1:5 inches long by 1:3 inches in diameter, with rounded 
extremities, received into distinct articular surfaces on the heads of the ribs. 
The surface of the bodies of the vertebre is roughened and striated. They 
slightly expand towards both articular extremities, therein differing from 
another genus to be described. The articular surfaces are smooth, and the 
posterior extremity is marked by the peculiar epiphysial ridge shown in the 
drawing of Mosasawrus vertebre in Mantell’s * Fossils of Sussex.” 
The neural spines are remarkable for their great breadth, being 2:5 inches 
long and 3 inches high, and also for the very strongly striated surface, which 
character appears to be common to nearly all the flat bones of this reptile. 
The dimensions of the vertebrz are :— 
Inches. 
Transverse NN ixi ee Di s : 
Height i Ye m s cae 
Length pem ¿V x us 3:6 
No. 10 e.—I refer to this species 7 vu which are flattened and channelled 
deeply on the internal surface, and very much expanded towards the head, 
where they have well-developed articular processes, which are irregularly 
cup-shaped, with thin margins. They taper very much in the other direction. 
Longest rib, of which there are 8, is 18 inches; also two abdominal ribs 
and three phalanges. 
These were found in a slab at the Waipara, close to the vertebre (10 d), 
and the evidence for connecting them with this genus is afforded by the 
peculiarly-excavated form of the head of the rib, which appears to fit the 
articulated surface on the tubercle, and also their striated surface ; and, further, 
certain fragments of spinous processes intermixed with the ribs also assist in 
this determination. 
No. 10 f—Three caudal vertebrz, from the Amuri Bluff, evidently belong 
to the same species with the above, and form one of the most important 
links i in connecting palwontologically these widely-separated localities. 
No. 10°6.—A slab of 20 caudal vertebrae, chevron processes, and neural 
spines, which also belong to this species. Obtained from the base of the 
boulder bed at the Amuri. 
The most anterior vertebra is 2-3 inches in diameter, whilst the last 
