1890,J HELODERMA SUSPECTUM, 237 



giving side anrl 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. DuMERiL (Auguste). — " Description des Reptiles nou- 

 veaus 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. (DeuxiemeMe'moire.) T. viii. p. 491 . — (Under 

 his " Quatrieme Famille : Varaniens ou Platynotes " occur 

 the following remarks : — " Cette tribu des Thccoglosses 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 Wiegmaim a etabli sous le uom de Helo- 

 dertna." This is followed by an allusion to the work of 

 Troschel upon the structure of this form.) 

 (L5) 1857. Gray (John Edward). — " On the Gtenns 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. GiRARD (Charles). — United States Exploring Ex- 



pedition during the years 1838-42, under Captain Charles 

 Wilkes, U.S. Navy. Herpetology, p. 195. — (Refers to the 

 . Helodernis as belonging to the family Faranidce.) 



(17) 1859. Baird (Spencer 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 (en- 

 larged), 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. Peters (Wilhelm). — " Uber 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 



