238 DR. R. W. SHUFELDT ON [-^Pl'- ^> 



remarks occur : — " Die Gerrhonotus, welche enige iiussere 

 Aehnliclikeit niit den Cercosauri haben, entfeinen sicli von 

 ihnen diirch die dachziegelformige Beschuppung des Unter- 

 kinns, Torziiglich aber durcb die eigentliiimlicbe schwammige 

 Zunge, welclie mit zwei besondevs geformten glatten Spitzen 

 endigt, ganz ahnlich, wie es die trefflicbe Abbildung von 

 Heloderma horridum zeigt, welclie Hr. Troscliel (Arcbiv fiir 

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



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



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

 a group Pleurodonta containing the Iguania, Diploglossa, 

 Thecaylossa, and Leptoglossu, giving the characters of each, 

 placing the IlelodennatidcB with the Anguidce and Ger- 

 rhonotidee in the Diploglossa.) 



(21) 1864. SuMiCHRAST (F.). — 'Annals and Magazine of Natural 



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

 ridum as belonging to the Varanidce ; gives a very interesting 

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

 Speaks of the difficulty of studying this species 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) 1864. Idem. — "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 Varanidce, and gives a brief account of its external 

 ■ appearance aud 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 antea.) 



(23) 1865. Kaup (J. J.). — " Einige Nachtrage zur Gattung Helo- 



derma horridum." Wiegm. Archiv fiir Naturgeschichte, pp. 

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

 very fair 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. — {H. suspectum 

 referred to in a collection of Reptilia and Batrachia of* the 

 Sonoran Province of the Neaictic 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 Helodermatidce in this place, aud 

 defines H. suspectum as a distinct species.) 



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



(There are three plates with this excellent paper, giving 

 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 



Ophidiens." Comptes Rendus, tom. Ixxvii. p. 1069. — (A brief 

 account of the teeth in Heloderma.) 



