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Show 1890.] HELODERMA S U S P E C T U M . 237 giving side and basal view of skull, the former showing the manner in which the dermal tubercles of the head eventually ossify and fuse with the skull; there are also given figures of the upper view of the tongue, the hyoid, the limbs, ribs, sternum, and pelvis.) (14) 1856. D U M E R I L ( A U G U S T E ) . - " Description des Reptiles nou-veaux ou imparfaitement connus de la collection du Museum d'Histoire Naturelle et Remarques sur la Classification et les Caracteres des Reptiles." Archives de Museum d'Histoire Naturelle. (Deuxiome Me'moire.) T. viii. p. 491.-(Under his " Quatrieme Famille: Varaniens ou Platynotes" occur the following remarks : - " Cette tribu des Thecoglosses est formee par la reunion de quatre families. La premiere (Palceosauri) ne comprend que des genres fossiles ; .... La deuxieme enfin (Helodermata) ne se compose que d'un seul genre, celui que Wiegmann a etabli sous le nom de Heloderma" This is followed by an allusion to the work of Troschel upon the structure of this form.) (15) 1857. G R A Y ( J O H N E D W A R D ) . - " O n the Genus Necturus or Menobranchus, with an account of its Skull and Teeth." Proc. Zool. Soc. London, p. 62. (In the place quoted the following notes occur:-" The chief difference between the teeth of the Proteus of the Lakes and the fangs of Serpents is, that in the former the aperture of the cavity is nearer to the centre of the tooth, some distance from the apex, while in the fang of the Serpent it is generally near to the tip. I know of no other instance of a Batrachian having this structure of its teeth, nor do I know any instance, except in the Mexican Lizard, called Heloderma horrida, in which all the teeth are uniformly furnished with a basal cavity and foramen, and this Lizard is said to be noxious; but the fact has not been distinctly proved.") (16) 1858. G I R A R D (CHARLES).-United States Exploring Expedition during the years 1838-42, under Captain Charles Wilkes, U.S. Navy. Herpetology, p. 195.-(Refers to the Heloderms as belonging to the family Varanidce.) (17) 1859. B A I R D ( S P E N C E R F.).-Report of the United States and Mexican Boundary Survey. P. 11, pi. xxvi.-(The plate gives a left lateral view of what appears to be a specimen of Heloderma suspectum, indifferently figured. There is also on the same plate an under view of the head, the vent (enlarged), and the details of the toes.) (18) 1859. Idem.-Pacific Railroad Reports ; No. 4. Report upon the Reptiles of the Route, vol. x. pt. vi. p. 38.-(Heloderma horridum mentioned in a list of reptiles collected by the expedition.) (19) 1862. P E T E R S ( W I L H E L M ) . - " fiber Cercosaura und die mit dieser Gattung verwandten Eidechsen aus Siidamerica." Abhandlungen der konigl. Akademie der Wissenschaften zu Berlin, p. 172. (On the page referred to, the following PROC. ZOOL. Soc-1890, No. XVII. 17 |