psephoderma. ^31 



Ordinal Position Uncertain. 



Genus PSEPHODERMA, Meyer 1 . 



Carapace consisting of a great number of polygonal scutes, which 

 are much more regular than those of Psephophorus, and having 

 several longitudinal rows of carinated scutes of somewhat larger 

 size than the others. Peripheral scutes angulated. 



There has been much discussion as to the systematic position of 

 this form ; it was at one time regarded by Baur 2 as undoubtedly 

 Chelonian, in which case it will clearly belong to the present sub- 

 order ; but the same writer 3 has subsequently suggested that the 

 specimens on which it is founded may belong to Nothosaurus. 



Psephoderma alpinum, Meyer \ 

 The type species. 

 Hab. Europe (Germany). 



37995. Cast of a slab showing the dorsal aspect of the imperfect 

 carapace. The original was obtained from the topmost 

 Rhastic — the Dachsteinkalk which immediately overlies 

 the Korsener-Schichten — of Ruhpalding, Bavaria, and is 

 preserved in the Museum of the Royal Mining Administra- 

 tion at Munich. It is the type specimen, and is figured 

 by Meyer in the ' Palaeontographica,' vol. vi. pi. xxxix. 



Purchased, 1861. 



38703. Two scutes approximating in contour to the peripheral 

 scute of P. anglicum, and probably belonging either to the 

 present or an allied form ; from the Lettenkohle (Lower 

 Keuper) of Hohenecke. Purchased, 1869. 



38703 a. Two similar scutes from the same locality in matrix. 



Purchased, 1869. 



Psephoderma anglicum, Meyer 5 . 

 Known only by detached scutes, and perhaps not specifically dis- 

 tinct from the type. 



Hab. Europe (England). 



R. 1512. Cast of an angulated peripheral scute. The original, 

 which is one of the types, was obtained from the Rheetic 

 of Bristol, and is preserved in the Museum at Bath. It 



1 Palseontographica, toI. vi. art. 6, p. 246 (1858). 



2 Zool. Anzeig. vol. ix. p. 688 (1886). 



3 Biol. Centralblatt, vol. ix. p. 190 (1889). * Loc. cit. 

 5 Palaeontographica, vol. xv. art. 5, p. 261 (1867). 



