OF THE PARIS BASIN. 63 



Caulinites associated with Flabellaria, Equisehun, Zosfera, Sec* 

 The St. Ouen and Beauce Limestones have each a flora with fresh- 

 water characters, Chara medicaginula and the deh'is of other 

 vegetation often being met with. Other plant remains, more 

 or less perfect, are found at different horizons in the Paris Ter- 

 tiaries, as in the Brie Limestone ; but the most important series 

 have been mentioned. Some minute fossils, met with in great 

 profusion, notably in the Calcaire Grossier {Ovuliies, Daciylopora, 

 &c.), and referred to the Foraminifera by many authors, have been 

 more recently classed among the Calcareous Algae by Munier- 

 Chalmast and Solms-Laubach.J 



Introduction to the Tables of Mollusca. 



The list of Eocene Mollusca in the first table which follows 

 is based on the admirable "Catalogue lUustre des Coquilles 

 Fossiles de I'Eocene des Environs de Paris," Bruxelles, 1886- 

 1889, by M. Cossmann, of which four fasciculi have already ap- 

 peared, comprising the Pelecypoda, Scaphopoda and Gastro- 

 poda. We have found it necessary to revise that catalogue to 

 some extent, and our remarks on the subject will be seen on 

 p. no. In the table several contractions are used. Thus: — 



U.E. (Upper Eocene) ^= The Sables Moyens, St. Ouen Limestone 



and Gypsum beds. 

 M.E. (Middle ^ocene) = The Calcaire Grossier. 

 L.E. (Lower Eocene) = The Sands of Aiz}^ and Cuise. 

 L.L.E. (Lowest Eocene)= The Sands of Bracheux, Limestone of 



Rill}' and Lignites. 



The list of Oligocene Mollusca in the second table is mainly 

 based on the work of MM. Cossmann and Lambert, " Mem. Soc. 

 Geol. France," 3e ser. t. iii. (1884), pp. i, et sqq. But we have 

 brought the nomenclature of the majority of the genera and 

 species mentioned, up to date, and are much indebted to M. 

 Cossmann for assistance in this matter. The numbers at the 

 head of the columns of the Oligocene table refer to the beds as 

 indicated in the classification on p. 35. The letters in the 

 column on the extreme right of the table refer to localities in the 

 Paris basin, but outside the typical Oligocene area of Etampes. 

 Thus c means Chateau Landon, e Essonnes, f Frepillon, L 

 Longjumeau, m Montmorency, n Neuilly, o Orsay, p Palaiseau, 

 R Romainville, s Sccaux, v Versailles, and vii, Villepreux. 

 C. DE Be means Limestone of Beauce, and m. sup Meulieres 

 Superieurs. 



*id, p. 256. 



t Mun. Chalmns Obs. sw h's als^ues calcai-es. Co»i/>tes rendits, t. Ixxxv. (1877), p. 

 814; Obs. stir les algties cakaires, Btill. Soc. Gcol. Fr., 36. scr., t. vii. (1879), p. 354, 

 661, figures. 



% Solms-Liubach, Einleituff in die Paldophytolo zie , Leipsic ^1887!. For further 

 details on the floras of the Paris Basin consult Watelet, Desc. des plantes foss. dtt Bass, de 

 Paris, Paris (1866). ScVimpitY, Paleontoiogie vc^etale.Pwci^, London, and ^Iadrid (1870-72), 

 3 vols., and atlas of plates. Svi\>ona., Flore Jossile de .'Cezanne, Mem. Soc. Geol. Fr., Paris 

 (1865-8) ; P. Ge:rva.\s., Zool. et Pal./raiif. (1859) \ De Blainville, Osteographie, &c., Paris 

 (1839-63), with atlas of plates. 



