I06 CLASSIFICATION OF AaTPHIBIAXS. 



frame upon the model of our theory of representation. 

 is as follows ; — 



Saurians. Climbers. Quadrumana Cuv. Incessores. 



Ophidians. Carnivorous. Ferae Linn. Kaptores.. 



Emvdosaurians. Aquatic. Cete. Natatores. 



Chelonians, Large-hoofed. Ungulata. Rasores (Gallina). 



Amphisbenians. ? Glires. Grallatores(Grall£E) 



As nothing more is said upon the subject^ we are 

 entirely at a loss to discover by what means the tor- 

 toises pass into the slow worms or amphisbenians, and 

 why the saurians^ or lizards^ intervene between these 

 and the ophidians. It would have been satisfactory, 

 also, to have stated in what way the Grallatores, whose 

 feet are the most lank and slender of all birds, were 

 analogous to the amphisbenians which have none ; or 

 through what intervening groups their analogy could 

 be traced. All these discrepancies, however, seem to 

 have originated in the oversight of breaking up the 

 true series of the birds, for it is the Grallatores, and 

 not the Rasores^ which (as our author is doubtless 

 aware of) naturally follow the Natatores. With every 

 wish, therefore, as may well be supposed, of adopting 

 an arrangement proposed upon our own theory_, Ave are 

 obliged to question the correctness of this view of the' 

 subject. 



(111.) It is hardly necessary to repeat, that in aU 

 attempts to trace the natural series of animals, those 

 species which have become, by whatever cause, extinct, 

 must be taken as much into consideration as those 

 which are now alive. This necessity is not only ap- 

 parent from the nature of the case, when viewed 

 abstractedly, but from the simple fact, that the dis- 

 covery of every new fossil animal, however strange in 

 its form, has tended to fill up a blank in the series of 

 those which are at present living. This has been 

 repeatedly acknowledged ; and if any absolute proof 

 was wanting that these extinct forms harmonised with, 

 and entered into the grand series of that creation which 

 belongs to this world, such proofs would be found in 

 the circle of the ungulaied quadj-upeds (^Ungulata), 



