218 A. GUNTHER ON SOME RARE REPTILES 
fifth, and sixth the posterior zygapophyses coalesce, forming a prominent process with 
a button-like end, the articular facets being at the under surface, and separated 
from each other by a narrow groove. In the seventh vertebra these zygapophyses are 
enormously developed into a short high club-shaped process, with the articular sur- 
Fig. 2. 
Wis 
Sixth, seventh, and eighth cervical vertebrae of Chelys fimbriata (lower and lateral views). 
faces coalesced into one, and at the lower surface of the bone. The eighth vertebra is 
distinguished by an extremely compressed centrum, much longer than the short neural 
arch, by cylindrical pleurapophyses, and by a long coalesced posterior zygapophysis, 
which is also club-shaped, but much less thick than that of the seventh vertebra. A 
division into two halves is indicated by a shallow notch at the top, and a deep hollow 
between the articular facets, which are placed at the sides and not on the lower surface 
of the process; a deep groove is hollowed out in front of each articular facet. 
In connexion with this peculiar structure of the posterior cervical vertebre it should 
be remembered that Chelys, like Chelodina, does not retract neck and head backwards 
within the shell in the median line of the body, but bends it sideways, so that the head 
lies either on the right or left forearm. 
The number of dorsal vertebre is eleven, the three hindmost forming a sacrum. 
Caudal vertebree 17 or 19. 
METOPOCEROS coRNUTUS (Wagl.). (Plates XLIII. and XLIV.) 
For many years the single specimen of this Lizard in the Paris Museum, described 
by Lacépéde and Duméril, remained unique, until a living example was presented to 
the Society in the year 1871'; and, singularly, ever since that period the Reptile-House 
? Proc. Zool. Soc. 1871, p. 627. 
