REPTILIA. 
15 
incomplete skeleton of Mystriosaurus from Whitby, in Wall- Wall-case 
case 3, is interesting from the fact that it is the actual 3 - 
specimen described as an “-Alligator” by Chapman and Ta ii^"i 2 . SeS 
Wooller in the Royal Society’s Philosophical Transactions 
for 1758. Though most abundant in the Jurassic rocks of 
Europe, similar crocodiles seem to have been widely distri¬ 
buted in Jurassic seas. A head of Steneosaurus exhibited in 
Wall-case 3 was obtained from a Jurassic formation in 
Madagascar. 
Belodon (Fig. 10) and allied reptiles of the Triassic period Wall-case 
have often been regarded as the primitive ancestors of the 3 - 
Crocodilia. The head of Belodon , as shown by fine specimens Tabl ®g Case 
Fig. 10.—Skull of Belodon kapffi, upper and palatal views, from the 
Keuper of Wurtemberg; about one-eighth nat. size. mx. maxilla; 
na. nasal; nar. external narial opening; or. orbit; p.7ia. posterior 
nares; p.or. pre-orbital vacuity; pmx. premaxilla. (After H. von 
Meyer. Wall-case 8.) 
from the Upper Keuper of Wurtemberg in Wall-case 3, 
certainly bears much resemblance to that of a long-snouted 
crocodile; while the back is armoured with scutes which 
are quite crocodilian (see also Table-case 13). The bones 
supporting the limbs, however, are very different from those 
of crocodiles, and suggest a close relationship with the con¬ 
temporary Dinosauria and Rhynchocephalia. Belodon occurs 
