PEOPESSOE OWEN ON THE DICTNODONT EEPTILIA. 
467 
seen at 24 , in fig. 2. The long, slender, curved and dense premaxillaries (22) are in 
the same good state of preservation. The lower jaw is likewise preserved in situ^ as 
when the mouth is shut. There is the same compound structure and entire or imper- 
forate outer surface of the ramus as in the original specimen. The symphysis is very 
short, fig. 3, y. A long and slender bone, on the inner side of the articular end of each 
ramus, appears to be a part or ‘cornu’ of the hyoid apparatus, fig. 3, 4o, 40. The vertebrae 
are biconcave, with broad horizontally fiattened zygapophyses and a moderately high, 
subquadrate compressed, fore-and-aft extended spine. The ribs acquire thoracic length 
at about the eighth vertebra from the head, and are longitudinally grooved as in the 
Ichthyosaur. There is an impression of a broad scapula {ib. m) and broader coracoid 
[lb. 52) near the remains of the proximal half of a humerus, ib. 53. The humerus has an 
expanded proximal end, and a concave outline behind; it has also a large medullary 
cavity with a compact wall. The radius (ib. n) and the ulna (ib. bs) are distinct. The 
remains of apparently a metatarsus show two of the larger and two of the rather more 
slender of these bones. All bespeak a reptile capable of progression on dry land, as 
well of swimming in the sea ; of one that might leave impressions of its foot-prints on a 
tidal shore. 
The skull of a rare New Zealand Lizard is figured in Plate XXV. fig. 5, as coming 
nearest to the Rhynchosaur in the proportions of the divided premaxillaries (ib. 22), each 
with a large and long tooth, which, were it completely confluent with the bone, would 
add still more to its resemblance to the New Red Sandstone fossil. 
Explanation of the Plate. 
PLATE XXV. B,hynchosaurus articeps. 
Fig. 1. Upper view of skull. 
Fig. 2. Side view of skuU. 
Fig. 3. Under view of the mandible and fore part of skeleton. 
Fig. 4. Portion of the vertebral column. 
Fig. 5. Side view of the skull of Mhynchocephalus (recent). 
All the figures are of the natural size. 
