[72]More recently Blanckenhorn in a paper entitled Nachträge zur Kentniss des Palaeogens in Ægypten, (Centralbl. f. Mineralogie ch. 1901, No. 9, p. 272) has named this species Lanistes bartonianus (spelled bartoninus in same paper).
[73]It has 4-5 flat spiral rows, the uppermost of which on the last whorls is often more strongly developed but not keel-shaped as in M. muricata. There are longitudinal ribs to the number of 8-12 over the whorls; the largest example was 9 millimetres long and had 8 whorls.
[75]The majority belong to the genus Nicolia, but more rarely specimens, apparently referable to a species of conifer, are met with.
[76]The largest trunk noticed had a length of 28 metres.
[77]Zittel, Beitr. z. Geol. u. Palaeont. d. Libysch. Wüste, I Th. (Palaeontographica, Vol. XXX) p. XCIII.
[78]Mayer-Eymar, Quelques mots sur les nouvelles recherches relatives au Ligurien et au Tongrien d’Egypte. Bull. de l’Inst. Egypt. (3) N. 4, 1894. Mayer-Eymar’s division of the lower beds into Ligurien inférieur and Ligurien supérieur is hardly convincing, especially as no fossils were found by that observer. The correlation of strata in widely separate areas by their lithological similarity is at least open to question, especially with beds of this type, which can indeed be exactly matched again and again at many levels in the same vertical succession. His diagnosis of the beds immediately below the basalt as Tongrien inférieur, rests, however, on firmer grounds, as this basalt sheet can be traced across the desert to beyond the latitude of Cairo, and is probably everywhere of approximately the same age.
[79]Schweinfurth, op. cit., Reise in das Depression Gebiet, etc.) p. 41.
[80]Beadnell, The Cretaceous Region of Abu Roash, near the Pyramids of Giza. Geol. Survey, Egypt, Report 1900, Pt. II. 1902, p. 44.
[81]Zur Geologie Aegypten, Pt. II, p. 458; Die Geschichte des Nil-Stroms in der Tertiär und Quartärperiode, etc., Z. d. Ges. f. Erdk. Z. Berlin, 1902, Tafel 10.