68 PKOCEKDINGS OF THE MALACOLOGICAL SOCIETY. 



tlirougliout the Eoceue beds of France aud England; various forms 

 of Naticidae are of frequent occurrence; among the AmpuUariidae 

 are the two interesting freshwater sliells Lanistes afitiquus from tlie 

 Lutetian Beds and Lanistes Bartonianus from the Bartonian, the 

 former s[)ecies being also found in the Mokattam Jieds of the neigh- 

 bourhood of Cairo ; various specimens of the Melaniidse occur, 

 including Bayania stygis, found also in the Eocene of Italy, aud 

 Diastoma costeUaUim, which is known from the Mokattam Beds near 

 Cairo, as also from the Lutetian and Bartonian horizons of Europe ; 

 Terchellum sopitmn is found in the Lower Mokattam Beds of Muela and 

 other areas of Egypt, occurring also in the Lutetian of the Paris Basin, 

 besides ranging in England from Lutetian to Lower Oligocene times; 

 there are shells belonging to the Cassididse, Pj'rulidse, and Lampusidae 

 (Tritonidae), as well as the FusidiB, which contain some striking forms 

 of the genus Clavalithes; the family Turbinellidse is represented by 

 the genus Vasum ; the Melongenid® contain Ileligmotoma, Pugilhia, 

 and Tudicla; among the Volutidoe is Voluta Arabica oH^ayev-'Ei^m^x, 

 a preoccupied name, and for which that of Valuta Beadnelli ^ is now 

 proposed ; a giant form of a Pleurotomoid shell, Surcnla ingens, has 

 been found in the Qasr el Sagha and Jebel el Qatrani Series ; shells 

 belonging to the Bullida3 also occur in the Fayum, Acera striatella 

 being cluiracteristic of Parisian and English Eocene beds. 



No forms of Cephalopods are referred to by Dr. Oppenheim as 

 occurring in the Fayum, but Dr. Schweinfurth collected Nautilus 

 in the ' Zeuglodon Valley', 12 kil. AV.S.W. of Gar el Gehannem in 

 tlie Birket el Qurun Series (Zeitsch. Ges. Erdkunde, Berlin, vol. xxi, 

 p. 240, 1886) ; while Mr. Beadnell recorded specimens of the same 

 genus from the Qasr el Sagha Series at the western end of Birket el 

 Qurun accompanied by Alectrgonia Clot-beyi, Plicatula polymorpha, etc. 

 Mr. Beadnell also noted that the fossils from the ' Zeuglodon Valley' 

 are found as pseudomorphs in sulphate of strontian (celestine). 



Dr. Oppenheim's monograph on the older Tertiary mollusca of 

 Egypt {Palao7itographica, vol. xxx, pt, iii, pi. xxvii, p. 348, 1903 

 and 1906) recognized 141 species of shells as occurring in the Middle 

 Eocene or Lutetian formation of the Fayum, composed of 83 Pelecypoda, 

 Scaphopoda, and 57 Gastropoda; 45 of these species are known 

 only in the Fayum, whereas the remainder are distributed over the 

 other Lutetian areas of Egypt and further countries of Northern 

 Africa, besides the Lutetian districts of Europe. In the following 

 list the species follow the order and arrangement as adopted in that 

 work, with some slight changes in nomenclature, an asterisk being, 

 placed against those forms which are restricted to the Fayum : — 



PELECYPODA. 



Family OSTKEID^. 



*GuYPH.a:A Phakaonum, Oppenheim (= Ostrea dorsata, Fraas, von 

 Deshayes ; Gryphan Escheri, Mayer-Eymar MS., G. Gu»ibrli, 

 M.-E. MS., G.'Kaufmanni, M.-E. MS.). 



^ Valuta Beadnelli, nom. mut. 



