238 DR. R. W. SHUFELDT ON [Ap^' ^ > 



remarks occur : — " Die Gerrhonotus, welche eiiige iiussere 

 Aeliiilichkeit mit deu Cercosauri haben, entfernen sich von 

 ihnen durcli die dachziegelformige Bcschuppung des Unter- 

 kiiins, vorziiglich aber durcb die eigenthiimlicbe scbwammige 

 Zunge, welche mit zwei besonders gef'ormten gbitten Spitzen 

 endigt, ganz Jihidich, wie es die treffliche Abbildung von 

 Heloderma horridum zeigt, welche Hi. Troschel (Archiv fiir 

 Natur. 1853, xix, 1 Taf. xiii. fig. 1) gelicfert hat.") 



(20) 1864. Cope (Edward Drinker). — Proceedings of the Aca- 



demy of Natural Suiences of Philadelphia : p. 227. — (Makes 

 a group Pleurodonta containing the Ljuuuia, Diploglossa, 

 Thecaglossa, and Leptofflossu, giving the characters of each, 

 placing the Helodennatidce with the Anguidce and Ger- 

 rhonotidce in the Diploylossa.) 



(21) 18(i4. SuMiCHKAST (F.). — 'Annals and Magazine of Natural 



History.' Lond. xiii. pp. 497-500. (Considers the H. hor- 

 ridum as belonging to the Varanidte ; gives a very interesting 

 acronnt of its habits and other matters referring to the species. 

 Speaks of the difficulty of studying this s])ecies from the 

 fact that it is nocturnal in its habits : of how tenacious they 

 are of life, and even after life is apparently extinct the 

 muscles long respond to stimulation.) 



(22) I8(i4. Idetn. — " Note sur les Mceurs de quelques Reptiles du 



Mexique." Bibl. univers. et Revue Suisse, Arch, des Scien. 

 Phys. et Nat. t. xix. pp. 45-61. (Places H. horridum in 

 the family Varanido', and gives a brief account of its external 

 appearance and of its habits. This paper seems to be sub- 

 stantially what had already appeared in the Ann. and Mag. 

 of Nat. Hist., for which see No. 21 anteu.) 



(23) 1865. Kaup (J. J.).— " Einige Nachtrage zur Gattung /fe/o- 



derma horridum." Wiegm. Archiv tiir Natuigeschichte, pp. 

 33-40 ; pi. iii. figs. 1 and 2. — (The figures present us with 

 very foir drawings of superior and inferior views of the skull 

 of a Heloderma horridum.) 



(24) 1866. Cope (E. D.). — Proceedings of the Academy of Natural 



Sciences of Philadelphia, pp. 303, 311. — (//. snspectum 

 referred to in a collection of Rcptilia and Ratrachia of the 

 Sonoran Province of the Nearctic Region. The collection 

 was made by Dr. E. Coues,) 



(25) 1869. Idem. loc. cit. p 5. — (This same author briefly refers 



to the characters of the HelodermutidiB in this place, and 

 defines //. suspectum as a distinct species.) 



(26) 1873. Gervais (Paul). — Journal de Zoologie, p. 453. — 



(There are three plates with this excellent paper, givinj< 

 figures of many of the structural parts of H. horridum, this 

 talented anatomist having secured a large specimen of the 

 Reptile.) 



(27) 1873. Idem. — "Structure des dents de I'Heloderme et des 



Ophidicns." Comjitcs Rendus, tom. Ixxvii. p. 1069. — (A brief 

 account of the teeth in Heloderma.) 

 [92] 



