2f7 



Geological Age ; — As has been alrcaciy mentioned, the species is existent 

 I'p to the Permian foi mation in Asia as well as in Europe. According to 

 SoMMEK, " Das Vorkommen dieser Art beschriinkt sich in Belgien auf Tournai. 

 Sie soli aber schon im obersten Niveau des Oberdevons und anderseits im 

 P^usulinenkalk dcs C)bercarbons von Russland vorhanden sein." The Chinese 

 species, however, nifLy represent the Lower Carboniferous Age, because 

 among the accompanying fossils there is Rliviiclionclla plciiVi do^i which is at 

 present believed to be confineci to the Lower Carboniferous except in the 

 neighbourhood of Moskou.^^ 



Rhynchonellidae. 



. >. 



Rhynchonella, Fischer. 



Ehynehonella pleurcdon Phillip?. 



PI. XXIV., Figs. 15-23. 



Tercbraiula plcurodon, Philuf.s : — Geology of Yorkshire, IL, p. 

 222. pi. XIL, figs. 25, 26, 28. 



Tet cbrafula vcntilahriiiii, PniLJ.iPS : — ib'd., p. 223. pi. XIL, figs. 

 3^ 3-^, 39- 



Rhynchonella fylcnrodon, Davidson : — Monogr. Brit. Carbon. 

 Brach., p. 10 f. pi. XXIIL, figs. 1-14, 16, 21. 



Rhynchonella flcurodon, Trautschold : — Die Kalkbruche von 

 Mjatschkowa, p. 358. pi. XXXVIL, figs. 7, 8. 



Rhynchonella pleurodo)i, De Koninck : — P'aune du Calcaire Car- 

 bonifere de la Belgique, VI. partie, p. 51. pi. XV., figs. 1-23. 

 Rhynchonella l(Cta De Konixck : — ibid., p. 54. pi. XV., figs. 24-51. 

 Rhynchonella pleui-odon, Wat.ter : — Lleber eine Kohlenkalkfauna 

 aus dcr iigyptisch-arabischen Wiiste. Z. d. d. g. G., XLII., p. 433. 

 pi. XXIV, fig. 0. 



Rhj nchodella plenrodon, De Koninck : — Descriptic)ns of the 

 Palaiozic P\«sils of New South Walse, pp. 75 and 170. pi. IX., 

 Fig. 4. 



1} TRAU isciiOLD: — Die Kalkbruche von Mjatschkowa, p. 



1S36. 



1836. 



1857. 



1878. 



? 1887. 



1887. 

 1890. 



? 1898. 



