2 Messrs. R. B. Newton and G. C. Crick on some 



villages of Al-Kura and Sarama stand," and apparently 

 beneath the " Deccan Trap " series, which rise to a height of 

 about 3500 feet. 



PELECYPODA and GASTROPODA. 

 By R. Bullen Newton. 



Among the specimens from Dihala are examples of 

 Farallelodon egertonianus, a species of the Arciform-Pelecy- 

 pods, which has been recorded from the Himalayas (Niti and 

 Spiti) and also from Somaliland, and Nucula cuneiformis, 

 previously found at both Spiti and Cutch, a closely related 

 form to the European A 7 , cacilia, Orbigny ( = iV. ornati of 

 Quenstedt), of Callovian and Oxford Clay horizons. 



Only one of the " Nobat" fossils is capable of determina- 

 tion. I refer to the natural limestone cast of a Nerinaza, 

 which shows strong affinities to JS. desvoidyi of Orbigny, 

 belonging to the European Corallian (Sequanian) Series. 



These specimens are of interest not only from the fact that 

 they enable us to announce for the first time the presence of 

 a Jurassic fauna in Arabia, but also because they present a 

 facies which connects them with the Bihin Limestone fauna 

 of Somaliland and that of the Spiti Shales of Northern 

 India, although, before pronouncing upon their probable 

 geological age, it will be necessary to briefly consider what is 

 known concerning the horizon of those two remote deposits. 



The Bihin Limestone. — From a palseontological point of 

 view tlie first notice of the Bihin Limestone of Somaliland is 

 to be found in " A Note on the Geology of Somaliland," 

 published in the ' Geological Magazine ' for 1S96, p. 290, 

 by Dr. J. TV. Gregory *, who gives a list of fossils found at 

 Bihin, 15 miles from Berbera, which were determined by 

 Messrs. G. C. Crick, F. A. Bather, and myself, including 

 Belemnites subhastatus, Zieten, Farallelodon egertonianus, 

 Stoliczka, Rhynchonella edwardsi, Chapuis & Dewalque, and 

 Rhynchonella subte/rahedra of Davidson, the presence of 

 which appeared to be of such value that the age of this lime- 

 stone was regarded as Bathonian. 



In fuither papers of the same journal, and immediately 

 following Dr. Gregory's account, Mr. Crick and myself gave 

 detailed notices of the fossils submitted to us, the Farallelodon 

 egertonianus being referred to (pp. 294-296) as originally 

 occurring in Northern Indian in company with several well- 

 known European Jurassic Mollusca determined by Stoliczka 



* References to the literature, when not included in the text, will be 

 found further on in the paper under " Bibliography.'' 



