CATALOGUE 



OF 



FOSSIL REPTILIA 



AND 



AMPHIBIA. 



Class REPTILIA. 



Ordinal position uncertain. 

 Group PLACODONTIA. 



This group is at present only known "by the skull and teeth, aucl its 

 ordinal position cannot be certainly determined without the evidence 

 of the vertebrae or the bones of the pectoral or pelvic girdles or limbs. 

 When the reptilian nature of Placodus was proved, it was referred 

 by Owen 1 to the Sauropterygia. Subsequently, however, the same 

 writer 2 appeared inclined to regard Placodus as allied to the 

 Anomodontia ; and Seeley 3 ranks the Placodontia as a suborder of 

 Anomodontia. It may be observed that all the described vertebras 

 and bones of the pectoral and pelvic girdles from the Muschelkalk, 

 except those of Dinosauria, appear to be of a Sauropterygian 

 type. 



1 See ' Paleontology,' 2nd ed. p. 23G (1861). 



2 Quart. Journ. Geol. Soe. vol. xxxy. p. 563 (1879). 



3 Phil. Trans, for 1889, p. 292. 



PAET IV. B 



