130 ECATJDATA. 



the opisthocoelous charecter of the vertebrae of the latter is noticed 

 by Cope in the ' Nat. Hist. Rev.' vol. v. p. 105. 

 Hob. Europe (France). 



33271. Part of the right maxilla; from the Middle Miocene of 



Sansan (Gers). Agrees with the type fragment figured 



by Gervais in his ' Zool. et Pal. Franchises,' pi. lxiv. fig. 24. 



Presented by Monsieur Ed. Lartet, 1857. 



Family PAL^OB ATRAC HID^E. 



Upper jaw toothed : sacral processes much expanded at the ter- 

 mination ; vertebra? proccelous ; no dorsal ribs ; urostyle articu- 

 lating with the sacrum by two condyles, and without transverse pro- 

 cesses. Tongue unknown. 



Wolterstorff l regards this family as allied on the one hand to the 

 Pelobatidce and on the other to the Xenopodidce 2 . 



Genus PALiEOBATRACHUS, Tschudi 3 . 

 Syn. Probatrachus, Peters 4 . 



The type genus. Skull very large, being longer than the whole 

 of the vertebral column in advance of the urostyle, with the fronto- 

 parietals anchylosed in the middle line, 1st and 2nd vertebrae 

 anchylosed together, and the sacral and two vertebrae immediately 

 in advance also anchylosed ; vertebral centra very short. No trace 

 of pollex ; metacarpals long and slender. 



The humerus is frequently nearly as long as the femur. The 

 transverse process of the 8th vertebra, and more rarely that of the 

 7th, may join with the sacral process in supporting the ilium. 



Palseobatrachus diluvianus (Goldfuss 5 ). 



Syn. Rana diluviana, Goldfuss 6 . 



Palceob at radius goldfussi, Tschudi 7 . 



The type species. Smaller than Rana temporaria. Sacral pro- 

 cess anchylosing with the transverse processes of both the 7th and 

 8 th vertebrae. 



1 Jahrb. nat. Yer. Magdeburg for 1886, p. 156 (1887). 



2 = Dactylethridce. Dactylethra being a synonym of Xenopus, the latter 

 Bhould be taken as the base of the family name. 



3 Mem. Soc. Neuchatel, vol. ii. art. 3, p. 81 (1839). 



4 Monatsb. k. Ak. Wiss. Berlin, 1877, p. 678. 



6 Nov. Acta Ac. Cojs. Leop.-Car. vol. xv. p. 119 (1831). — Rana. 



6 hoc. cit. 7 Mem. Soc. Neuchatel, vol. ii. art. 3, p. 81 (1839). 



