15. Yellow sandy friable limestone with casts of shells and _Mesalia fasciata_, _M. oxycrepis_, May.-Eym., _Turritella Lessepsi_, _T. pharaonica_, Cossm., _Alectryonia Clot-Beyi_, _Ostrea Reili_ ½ 16-17. Sands, sandy clays and clays with a double band of limestone containing _Ampullina hybrida_, Lam., _Melongena nilotica_, var. _bicarinata_, May.-Eym., _Tudicla_ aff. _umbilicaris_, May.-Eym., _Turritella Lessepsi_, _T. parisiana_, May.-Eym., _Solarium_ sp., _Alectryonia Clot- Beyi_, _Plicatula polymorpha_ (occasional), _Lucina fortisiana_, Defr., _L. pharaonis_, Bell., _Mytilus affinis?_ J. and C. Sowerby, _Astrohelia similis_, _Goniaræa elegans_, Mich.; numerous vertebrate remains both above and between limestones including _Zeuglodon Osiris_, _Eosiren libyca_, _Barytherium grave_, Andr., _Moeritherium Lyonsi_, _M. gracile_, Andr., _Gigantophis Garstini_, Andr., _Pterosphenus Schweinfurthi_ and _Tomistoma africanum_, Andr. The remains of a siluroid fish are abundant; also _Propristis Schweinfurthi_, Dames. Large numbers of coprolites. Silicified wood 12 18. Brown sandy limestone with casts of shells, _Akera_ aff. _striatella_, Lam., _Ampullaria_, n. sp., _Gisortia gigantea_, Munst., _Lanistes antiquus_, Blanck., _Melongena nilotica_, var. _bicarinata_, _Mesalia_ sp., _Cassidaria nilotica_, _C._ aff. _nodosa_, _Solarium_ aff. _bistriatum_, Desh., _Alectryonia Clot-Beyi_, _Cardium Schweinfurthi_, _Exogyra Fraasi_, _Lucina pharaonis_, Bell., _Macrosolen Hollowaysi_, J. Sowerby, _Meretrix nitidula_, Lam., _M. parisiensis_, Desh., _Ostrea flabellula_, Lam., _Tellina_ sp., overlying clays with gypsum 4 19. Sandy limestone with numerous _Carolia placunoides_ and _Turritella imbricataria_, Lam. 1 20. Greyish-blue and brown ferruginous, sandy, and other clays. Plant remains 13 21. Friable shelly limestone with occasional small calcite veins ½ 22. Clays 4 23. Hard yellow sandy limestone with _Ostrea_ and _Anisaster_ (_Agassizia_) _gibberulus_ ½ 24. Clays with thin bands of fibrous gypsum 6