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



villages of Al-Kura and Samma 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 Diliala are examples cf 

 Parallelodon egertonianus, a species of the Arciforni-Pelecy- 

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

 Spiti) and also from Somaliland, and Niicula cimeij'ormisy 

 previously found at botii Spiti and Cutch, a closely related 

 form to the European N. cacilia, Orbigny { = N. ornati of 

 Quenstedt), of Callovian and Oxford Clay horizons. 



Only one of the " Nobat^' fossils is capable of deteruiinfi- 

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

 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 th; 

 they enable us to announce for the first time the presence 

 a Jurassic fauna in Arabia, but also because they prese 

 facies which connects them witli the Bihin Limestone tau. 

 of Somaliland and iliat ol: the Spiti Shales of Nortlier 

 India, although, before pronouncing upon their ])robab 

 geological age, it will be necessary to briefly consider what 

 known concerning the horizon of those two remote deposits. 



The Bihin Limestone. — From a palseontological ])oint d 

 view the first notice of the Bihin Limestone of SonialilaDd ' 

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

 published in the 'Geological Magazine' for 1896, ]>. 29C 

 jjy Dr. J. W. Gregory *, wdio gives a list of fossils found ,,a 

 Bihin, 15 miles from Berbera, which were determined \ 

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

 Belemnites suhhastatus, Zieten, Parallelodon egertoniaHusy 

 Stoliczka, Bhynchonella edwardsi^ Chapuis & Dewalque, and 

 Rhynchonella suhtetrahedra of Davidson, the presence of 

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

 stone was regarded as Bathonian. 



In further 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 Parallelodon 

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

 occurring in Northern Indian in company witli several Well- 

 known European Jurassic Mollusca determined by Stoliczka 



* References to the literature, when not included iu the text, wih be 

 found further on in the paper under " Bibliography." 



