1890.] HELODERMA SUSPECTUM. 237 



giving side and basal view of skull, the former showing the 

 maimer 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) 1836. DuMi:RiL (Auguste). — " 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. (DeuxiemeMemoire.) T. viii. p. 491 . — (Under 

 his "Quatrieme Faiuille: Varaniens ou P/atynotes" occur 

 the following remarks : — " Cette tribu des Thccoglosses est 

 formee j)ar la reunion de quatre families. La premiere 

 {Palceosauri) ne comprend que des genres fossiles ; .... La 

 deuxieme eufin (Helodermuta) ne se compose que d'un seul 

 genre, celui que Wiegmann a etabli sous le nom de Helo- 

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

 Troschel upon the structure of this form.) 



(1.^) 185/. Gray (John Edward). — " On the Genns JVecturus or 

 Menobranchus, with an account of its Skull and Teeth." 

 Proc. Zool. Soc. London, p. G2. (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 tiie 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 liizard, 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 

 Heloderms as belonging to the family FaranidcB.) 



(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 vi^hat 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 ot the toes.) 



(18) 1859. Idem. — Pacific Railroad Reports ; No. 4. Report upon 



the Reptiles of the Route, vol. x. pt. vi. p. 38. — {Heloderma 

 horridam mentioned in a list of reptiles collected by the 

 expedition.) 



(19) 1862. Peters (Wilhelm). — " Uber Cercosaura und die mit 



dieser Gattung vervvandten Eidechsen aus Siidamerica." 

 Abhandlungen dcr konigl. Akademie der Wissenschaften 

 zu Berlin, p. 1/2. (On the page referred to, the following 

 Proc. Zool. Soc— 1890, No. XVIL 17 



[fll] 



