Jurassic MoUusca from Arabia. 3 



and regarded by that author as belonging to Quenstedt's 

 " Brown Jura " or the " Dogger," evidence which was con- 

 sidered at the time in favour of the Bihin Limestone being 

 recognized as of Bathonian age. Mr. Crick's remarks, 

 however (pp. 296-298), on Belemnites suhhastatus favoured 

 the Callovian age for this limestone, since that Cephalopod 

 was said to be characteristic of the macrocejyhalus-zone, of 

 Germany. 



At a later period, during the discussion on a paper by 

 Dr. Gregory " On the Geology and Fossil Corals and 

 Echinids of Somaliland," read before the Geological Society, 

 Mr. G. C. Crick stated that the Cephalopoda from the Bihin 

 Limestone " appeared to indicate the presence of an horizon 

 somewhat younger than Bathonian " (Quart. Journ. Geol. 

 Soc. 1900, vol. lvi. p. 45). 



Since the Bihin Limestone fossils were described, further 

 specimens in the British Museum have been examined from 

 the same beds, although no published account of them has yet 

 been issued. Among these the following provisional deter- 

 minations are now made : — Nerimea cf. elatior, Orbigny, a 

 Corallian species represented by some narrow elongate natural 

 casts; Volsella ( = Modiola) subangustissima, Dacque", a form 

 found in the Kimeridgian of Western Somaliland (Atschabo) ; 

 Pholadomya cf. carinata, Goldfuss, originally described from 

 the Callovian of the Sarthe region of France, and which has 

 in more modern years been recognized by Douville* as part of 

 the Jurassic (Sequanian) fauna of Choa to the south of 

 Abyssinia; Ceromya cf. striata, Orbigny sp. ( = obovata, 

 Eoemer, and inflata, Agassiz), belonging to Corallian and 

 Kimeridgian times, a species recorded by G. Miiller as 

 occurring in the Kimeridgian of German East Africa ; and 

 Terebratula subsella, Leymerie, ranging from Corallian to 

 Kimeridgian, although perhaps more characteristic of the 

 former period, is known from the Kimeridgian of German 

 Somaliland through the researches of Dr. Dacque", and ac- 

 cording to Prof. Douville it also occurs in the Jurassic rocks 

 of Choa to the south of Abyssinia. 



The Spiti Shales. — The paleontology of the Spiti deposits 

 of the Northern Himalaya appears to have been first made 

 known to us by Captain J. D. Herbert in 1831, who gave an 

 account, with a plate of figures, of a number of fossils that 

 had been collected in those beds by Dr. Gerard. This was 

 followed in 1833 by a further notice of the same collection 

 written by the Rev. R. Everest, accompanied by two plates 

 of fossils. 



Thirty years afterwards the Gerard collection was again 



1* 



