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See also:ORDER 3 . NUDA OR BATRACII. In this See also:classification we See also:notice three points, which indicate a decided progress towards a natural See also:system. (I) The four orders proposed by See also:Brongniart are no more considered co-subordinate in the class, but the Saurians and Ophidians are associated as sections of the same order, a view held by See also:Aristotle but abandoned by all following naturalists. The distinction between lizards and See also:snakes is carried out in so precise a manner that one genus only, See also:Amphisbaena, is wrongly placed. (2) The true See also:reptiles have now been entirely divested of all heterogeneous elements by relegating positively See also:Caecilia to the Batrachians, a view for which See also:Oppel had been fully prepared by Dumeril, who pointed out in 1807 that " See also:les cecilies se rapprochent considerablement See also:des batraciens auxquels elles semblent her l'ordre entier des serpens." 4 (3) An See also:attempt is made at arranging the genera into families, some of which are still retained at the See also:present See also:day. In thus giving a well-merited prominence to Oppel's labours we are far from wishing to detract from the See also:influence exercised by the See also:master spirit of this See also:period, See also:Cuvier. Without his guidance Oppel probably never would have found a See also:place among the promoters of herpetological See also:science. But Cuvier's See also:principal researches on reptiles were incidental or formed See also:part of some more See also:general See also:plan; Oppel concentrated his on this class only. Cuvier adopts the four orders of reptiles proposed. by Brongniart as See also:equivalent elements of the class, and restores the See also:blind-See also:worms and allied lizards and, what is worse, also the Caecilias, to the Ophidians. The chameleons and geckos are placed in See also:separate See also:groups, and the mode of dividing the latter has been retained to the present day. Also a natural See also:division of the snakes, although the See also:foreign elements mentioned are admitted into the order, is sufficiently indicated by his arrangement of the " vrais serpens proprement dits " as (I) non-venomous snakes, (2) venomous snakes with several maxillary See also:teeth, and (3) venomous snakes with isolated See also:poison-fangs. He distinguishes the See also:species of reptiles with a precision not attained in any previous See also:work. Cuvier's researches into the See also:osteology of reptiles had also the See also:object of discovering the means of understanding the fossil remains which now claimed the See also:attention of See also:French, See also:English and See also:German naturalists. See also:Extinct Chelonian and Crocodilian 4 Memoires de zoologie et d'anatomie comparee (See also:Paris, 1807, 8vo);, P. 45. remains, Pterodactylus, Mosasaurus, See also:Iguanodon, See also:Ichthyosaurus, Teleosaurus, became the subjects of Cuvier's classical See also:treatises, which See also:form the contents of the 5th See also:volume (part 2) of his Recherches sur les ossemens fossiles, oit l'on retablit les caracteres des plusieurs animaux dont les revolutions du globe ont detruit les especes (new ed., Paris, 1824, 4to). All the succeeding herpetologists adopted either Oppel's or Cuvier's view as to the number of orders of reptiles, or as to stain- the position Batrachians ought to take in their relation See also:vine. to reptiles proper, with the single exception of D. Additional information and CommentsThere are no comments yet for this article.
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