ORDER SAURIA, 115 



We may separate from the ameiva, certain species 

 which have all the scales of the belly, legs, and tail, 

 raised by a keel ;* and others, in which the scales 

 of the back are themselves carinated, so that the 

 flanks alone have small grains. t These species ap- 

 proximate still to the lizards by having a collar under 

 the neck.t 



The Lizards, proper. 



Form the second genus of the lacertians. They 

 have the bottom of the palate armed with two ranges 

 of teeth, and are otherwise distinguished from the 

 ameiva and safeguards, because they have a collar 



11. ciii. 3, 4, does not differ from the Litterata; finally, his Tete RoiigCy^^. 

 I. xci. 1,2, is a common green lizard. He has probably been led into 

 error by the illuminated plates of Seba. The lac. S-lineata appears to me 

 to be a L. Cceruleocephala, a part of the tail of which being broken, was 

 reproduced with small scales, a case of constant occurrence after such 

 accidents. The oscis of this new portion of tail is always a cartilaginous 

 stem without vertebra. On such accidents species cannot be found, as 

 Merrem has done in his Teyus Monitor and Cyaneus. 



* One of them has, in one sex, two small spines on each side of the 

 anus, which has given rise to the genus Centropyx of Spix, xxii. 2. 



-j- The sti-iped lizard of Surinam, Daud. III. p. 347, Fitzinger makes of 

 it his genus Pseudo- Ameiva. 



X It even appears to me that the Centropyx has teeth in the palate, 

 otherwise both these kinds of lizard have the head of the Ameiva; no 

 bone on the orbit, &c. 



N.B. Fitzinger makes a genus (Tkyus) of the lucerta teyou of Daudin, 

 which would seem to have but four toes on the hind feet ; but this rests 

 only on an incomplete description of d'Azara, and docs not appear to me 

 sufficiently authentic, 



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