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Show 236 DR. R. W. SHUFELDT ON [Apr. 1, with a fair idea of the reptile. A drawing is also given of the superior aspect of the head.) (7) 1836. D U M E R I L (A. M . C.) and B I B R O N (G).-Erpetologie Generale ou Histoire Naturelle complete des Reptiles. T. iii. pp. 499-501.-(In this justly celebrated work a brief description of the Heloderma is given, which adds nothing to previous descriptions of other authors.) (8) 1837. G R A Y (J. E.).-Proceedings of the Zoological Society of London. P. 132.- (Places the Helodermatidce with the Leptoglossce, a subdivision of the Saurians as proposed by Wiegmann.) (9) 1838. B O N A P A R T E ( C H A R L E S L U C I E N ) . - " Synopsis Vertebrat-orum Systematis." Nuovi Annali delle Scienze Naturali. Anno i.Tomo ii. Bologna, pp. 105-133.-(On page 124, family 13 is represented by the Helodermatidce, and subfamily 20 by the Helodermatina, the latter being the only subfamily ranged under the former. The cacography in either case is retained. The year, although given as above both on back of volume and the titlepage, should probably be 1839, unless Tomo iii. was published in 1839. Compare same work below.) (10) 1840. Idem.-" Prodromus Systematis Herpetologias." Nuovi Annali delle Scienze Naturali. Anno ii. Tomo iv. Bologna, pp. 90-101.- (Here the Heloderms are placed with the Leptoglossi of this author, between the Varanidce and the Ameividce (Tribus 2) ; and upon p. 95 the following characterization of them is given : "Familia 13. Helodermatidce. Lingua. . . . laminas supraorbitals cutaneae : oculi palpe-brati; aures conspicuas: membrana tympani superficialis; caput tuberculato-squamosum, depressum : corpus elong-atum. " Subfamilia 21. Helodermatina. Dentes adnati: cutis sulculis exarata: squamae tuberculiformes osseas : pori fe-morales nulli." (11) 1840. Idem.-" Systema Vertebratorum." Trans. Linn. Soc. London; vol. 18. pp. 247-305. Separate, 1. p. 1. 58pp. Helodermatidae and Helodermatina, p. 294; Sep. 37.- (In the last place there occurs the same characterization of the Helodermatidae and the Helodermatina as is quoted above from the Prodromus, with the exception that the words " Familia" and " Subfamilia" were not introduced, and owing to a certain re-arrangement the subfamily is 20 instead of 21 as above given.) (12) 1845. G R A Y (J. E.).-Catalogue of the Specimens of Lizards in the Collection of the British Museum. P. 14.- (Heloderma horridum is here alluded to under the name of "The Caltetepon," and isolated as the representative of the family " Caltetepons " (Helodermidce).) (13) 1853. T R O S C H E L (F. H.).-Archiv fur Naturgeschichte ; t. i. p. 29-1.-(Tat. xiii. and xiv. present us with very good figures, |