REPTILES. 
25 
It constitutes one of the numerous interesting novelties obtained by Mr. 
Darwin in the Galapagos. The specimens, which are of various ages, were taken 
in Chatham Island and in Charles Island. 
Genus — CENTRURA. Sell. 
Caput breve, triangulare. Aures magncB, antice cutis plied, hand dentatd, partim 
celatce. Nares magnee, rotiindce. Gula trmisversh suhplicata. Collum atque 
corpus haud cristata ; hoc depressum, latum, cute longitudinalitlr plicatd. Cauda 
teres, hasin versus subdepressa, squamis fortihus spinosis verticillatis . Squamae 
capitis numerosa, parvee, rotundatce, non imbricatce — corporis minimee, rotunda, 
subconvexcB, Iceves. Pori femorales et prae-anales nulli. Dentes palatini. 
The propinquity of this genus both to Oplura and to Soryphorus is very 
obvious. It differs, however, from both in several structural characters. From 
the former in the absence of denticulations on the anterior margin of the ear, and 
of a nuchal crest ; from the latter in the presence of palatine teeth. Its place is 
probably between these two genera. 
Centrura Flagellifer. Mihi. 
Plate XIII. — Fig. 2. 
Description. — Head almost equilaterally triangular, the muzzle rounded; scales of the head small, 
nearly equal, rounded, not imbricated, those of the temples subconical ; nostrils round, large, 
confined to the nasal scales. Ears rather large, the t3^mpanum lying beneath the surface, and 
partly concealed by an anterior fold of skin, -which is not denticulated, as in Oplura. Skin of 
the neck folded at the sides, that of the body flaccid, and with strongly marked lateral folds, 
extending from the shoulder to the thigh. Scales of the neck and back very small, round, 
slightly convex, very smooth. Skin of the throat rugose, with a transverse pectoral fold not 
very sti’ongly marked. Scales of the throat similar to those of the back ; those of the belly 
broader and less convex ; all perfectly smooth. Tail about the length of the head and body 
flattened at the base, then round, surrounded with strong spinous verticillated scales, of which 
there are about fifty circles ; beneath smooth. Legs of moderate length, strong, covered with 
small conical, imbricated scales. The toes compressed towards the extremity, and terminated 
with a strong, short, compressed nail. 
Colour. — The colour can only be partially described, as the specimen has been long in spirits. It 
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