238 DR. R. W. SHUFELDT ON [Apr. 1, 



remarks occur : — " Die Gerrhonotus, welclie enige iiussere 

 Aelinliclikeit niit den Cercosauri liaben, cntfernen sich von 

 ilinen durch die dachziegelfonnige Beschuppung des Unter- 

 kiiins, vorziiglicli aber durch die eigenthiimliclie schwammige 

 Zunge, welche mit zwei besonders geibrmten glatten Spitzen 

 endigt, ganz abnlicb, wie es die treffliclie Abbildung von 

 Heloderma horridum zeigt, welche Hr. Troschel (Archiv 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 lyuania, Diploglossa, 

 Thecaylossa, and LeptO(/lossa, giving the characters of each, 

 placing the Helodennatidce with the Anguidce and Ger- 

 rhonotidce in the Diploglossa.) 



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



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

 r2(Zt(7w 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 Varanidct, 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 antea.) 



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



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 Nearctic Region. The collection 

 was made by Dr. E. Coues.) 



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



to the c\\axiictexs oi t\\Q Ilelodermatidce in this place, and 

 defines EL, suspectum as a distinct species.) 



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



(There are three plates with this excellent pajier, giving 

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

 talented anatomist having secured a large specimen of the 

 Rei)tile.) 



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



Ophidiens." Comptes Kendus, torn. Ixxvii. p. 1 069. — (A brief 

 account of the teeth in Heloderma.) 



