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Show REPTILES. 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. 25 GENus-CENTRURA. Bell. Caput breve, tt·iangulare. Aures magnaJ, antice cutis plica, haud dentatd, partim celataJ. Nares magnCl!, 'l'otundCl!. Gula transverse subplicata. Collum atque corpus ltaud cristata; ltac depressum, latum, cute longitudinaliter plicatd. Cauda let·es, basin vet·sus subdepressa, squamis fortibus spinosis verticillatis. Squamre capitis numerosce, parvaJ, t·otundat'Cl!, non imbricatce-corporis minimce, 1·otundce, subconvexce, lCEves. Pori femorales et prre-anales nulli. Dentes palatini. The propinquity of this genus both to Oplura and to Doryphorus 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. lJfihi. PLATE XIII.-Fw. 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 tympanum 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 strongly 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. . . . CoLoun.-The colour can only be partially described, as the specimen has been long m spmts. It E |