Mesozoic Rocks of Sinai. 845 
observed that Douvillé (1918, page 34) noted that in this bed, which 
still contained Bajocian species, were already a number of species 
of Bathonian age. 
“The Cephalopods are well preserved in these beds, the following 
being the most commonly represented : Calloceras Humphriest 
Sow., Phylloceras disputabile Zittel, and Ph. mediterraneum Neumayr, 
and the new types Ermoceras mogharense H. Douv. and Thamboceras 
mirum H. Douvillé. Above these strata follow limestones with 
Terebratula quillyensis and Ostrea (Liogryphea) costellata d’Orb., 
then a succession of beds of grits and limestones, with Rhynchonella 
Orbignyi, R. concinna Sow., R. obsoleta Sow., and Ostrea (Arctostrea) 
avita Douvillé. The Bathonian must be considered as having 
preceded the oscillations of the grits. The echinid fauna is somewhat 
poor in known forms, except for the spines of Plagiocidaris bathonica 
Cotteau and P. meandrina Ag. The Mollusca have been described 
by Douville, it is to be noted that some of these reappear in the 
Callovian and even in the Oxfordian. The Callovian (if its base be 
placed at the level of the limestone with flint nodules above the last 
band of grit) is well represented by oolite and ferruginous limestones 
characterized by an abundance of small Atelostomatous sea-urchins 
of small size, closely related to Pygurus, but having their periproct 
in a marginal or supramarginal fossette, which brings them closer 
to the Cretaceous Bothriopygus, and which places them in the new 
genus Bothryopneustes R. Fourtau. Above follows a great thickness 
of blue-green marls broken by a band containing Hudesia cardium 
and Pygurus sp. nov. 
*« The limit between the Oxfordian and the Callovian is very difficult 
to determine, but certain beds are indisputably Oxfordian. One 
of these contains Terebratula Lamberti Douv., Myoconcha Rathierr 
d’Orb., Ostrea (Arctostrea) amor dOrb., Perisphinctes varicostatus 
Buckland, Aspidoceras Babeaut d’Orb., Ctenostreon proboscideum 
Philips, Pecten fibrosus, Phill., and Rhabdocidaris capremontana 
Desor; while above are limestones with Collyrites bicordata 
Desmoulins. 
“ Above these limestones commences what we regard as the 
Upper Jurassic, which is here represented by a stage including both 
Coral Rag and Kimmeridge Clay, a stage established i in Portugal 
by Choffat, the Lusitanian. It commences with a thick mass of 
dolomitic limestones containing Diplocidaris gigantea Ag. and 
Gymnocidaris (Hemicidaris) Agassiz Roemer, fossils distinctly 
characteristic. The upper part corresponds to the “ Glandarienkalk’’ 
of Syria, with Pleqiocidaris Choffati de Loriol, Pseudocidaris 
lusitanica de Lor., and numerous crinoid stems belonging mainly 
to the genus Muillericrinus. An interesting facies is presented by a 
dolomitic white limestone with mollusca changed to calcite, of which 
fine samples have been collected. The Portlandian and Tithonian 
are not represented.” 
The result of the operations of the Geological Survey and 
