224 Mr. H. B. Brady on a 



scriptlon of an allied symmetrical form*, the two being placed 

 together as representatives of a new genus " Orobias " {0. an- 

 tiquior and 0. cequalis), is dismissed in the same way as afford- 

 ing no evidence of value, owing to the absence of any details 

 of microscopical structure. Indeed D'Eichwald's separation 

 of these two forms from the genus Nummulina is grounded 

 on the non-tubulation of the shell and the lack of any indica- 

 tion of a canal-system in the specimens he had examined. 



Buvigniert described and figured an Upper Jurassic Num- 

 mulite {N. Humhertina) from the Astarte-marl containing 

 Exogyra virgida ; but here, again, Dr. Giimbel regards the 

 representation as insufficient to set its Nummuline affinity be- 

 yond dispute, though lending probability to the assumption. 



More recently Fraas| obtained from the Cretaceous forma- 

 tion of Palestine certain fossils which he assigned to the 

 genus Nummulina, describing them under three specific 

 heads. With regard to the first of them, N. variolaria, var. 

 prima, Dr. Giimbel supposes that the traveller has mistaken 

 the age of the bed from which it was derived, but does not 

 give any very clear ground for this conclusion. The iV^ cre~ 

 tacea, Fraas, after careful examination of the specimens, is 

 assigned to the genus Alveolina] and, lastly, N. arhiensis, 

 Conrad, though certainly a Nummulina, differs so little from 

 N. hiarritzensis and A^. variolaria that it is set down as pro- 

 bably of Tertiary age. 



Nummulina jurassica. — The author then proceeds to de- 

 monstrate the existence of the Kummulite in strata of the 

 Jurassic period, and describes, under the name A^. jurassica, 

 certain minute fossils collected by the Geological Surveyors 

 in Franconia. The precise horizon at which the specimens 

 were found was a sponge-bed of the Ammonites-tenuilohatus 

 zone § and! a portion of the A.-dentatus zone; the locality, 

 Schaflohe near Amberg. The specimens are stated to be 



* Lethaea Rossica, par Edouard d'Eichwald (1855-1861), vol. i. p. 352, 

 pi. 22. fig. 16. 



t Stat. G^ologie d. D6p. de la Meuse, 1852, p. 338; Atlas, p. 47, pi. 30. 

 figs. 32-35. 



X Geol. Beobacht. am Nil, auf der Sinai-Halbinsel u. in Syrien, 1867, 

 S. 82-84, Taf. 1. fig. 8. _ 



§ The "zone of Ammmiites tenuilobatus " is one of Oppel's original 

 divisions of the Jurassic strata, and is well marked in the south of the 

 Grand-duchy of Baden. My fiiend G. A. Lebour, F.R.G.S., of the 

 Geological Survey, sends me the following note, extracted from Dr. 

 Waagen's ' Essai d'une Classification generale du Jura superieur ' 

 (Munich, 1865) : — " The zone of Amm. tenuilohatiis and RhynchoneUa 

 incanstam is equivalent to the ' Lower Kimmeridge Clay ' of England, 

 the ' Corallien ' of La Rochelle, the ' Astartien ' of Switzerland, and the 

 ' Scyphia Limestone ' of Swabia and Franconia.'' 



