268 CLASSIFICATIONS OF THE AMPHIBIA. 



Second Ordre. — Perennibranches. Perennibranchia. 



Ire Famille. — Ichtyo'ides. Ichthyoida. 



Les Genres. — Protee. Sirene. 



It will be seen that Latreille places the Axoloil (Siredon 

 pisciformis) amongst the caducibranchious Amphibia, but it 

 had been previously discovered that its branchice are persist- 

 ent ; the details of which may be learnt from a paper by Sir 

 Everard Home, published in the ' Philosophical Transactions' 

 for the year 1824, p. 419. One of the accompanying plates 

 accurately represents the external gills as still remaining 

 on a female Axolotl when in the state of possessing fully de- 

 veloped ova ria, and just before the ova are shed; 1 thereby 

 proving her to be a perfect animal. Consequently Latreille 

 should have stationed the Axolotl next to the Proteus in his 

 second order. 



The Baron Cuvier, in both editions of the i Regne Animal ' 

 (1817 and 1829), has merely followed Brongniart in consi- 

 dering the animals now under our notice, as forming a part of 

 the third order, and the whole of the fourth order, of Reptiles, 

 being his third class of Vertebrata. 



Dr. Wagler, in his work entitled ' Natiirliches System der 

 Amphibien,' 1830, calls the class, (after Linnaeus) Amphibia, 

 in which he separates the different animals, under the names 

 of Testudines, Crocodili, Lacertae, Serpentes, Angues, making 

 them his first five orders respectively ; and then follow his 



Ordo VI. — C&cilijE. 



Familia 1. Hedrceoglossce. Genus. Cacilia. 



Ordo VII.— Ranje. 



Familia 1. Aglossce. Genus. Asterodactylus, (Pipa). 



Familia 2. Phaneroglossce. 



Div. 1 . Cauda nulla. 



Genera. — Dactyleihra. Rana. Hyla. Ceratophrys. Breviceps. Bombi- 

 nator. Bufo. Otilopha. Rhinella. 



Div. 2. Cauda distincta. 



Genera. — Salamandra. Triton. 



1 For a similar anatomical plate exhibiting the ovaria and ova of a female 

 Proteus anguinus, together with its description, see ' Articolo sopra un Pro- 

 teo femmina, con tavolo di Rusconi,' 1828. We must hope that some able 

 American zootomist will ere long dissect a mature and oviferous female, of 

 every one of the remaining Diplopneumenous species, and make the like il- 

 lustrations, with accurate engravings, in order to determine, after this most 

 satisfactory manner, the exact form and structure of each animal, in its 

 perfect state . 



