OE THE MEUX-WELL DEPOSITS* 917 



Palaeontology of the Well, 



The Chalk. — I did not examine the Chalk cores, and have only 

 to remark that on the surface of one I noticed that the borer had 

 cut in two a specimen of Dercetis elongatus, a well-known fish of 

 the Upper Chalk. 



The Upper Greensand. — Prom this horizon I obtained only one 

 small sample. As it yielded the following remains, including two 

 new species of Entomostraca, it might have repaid further examina- 

 tion : — 



Cristellaria acutauricularis. 



rotula. 



Nodosaria raphanistrum. 

 Echini spines &c, several species. 

 Cythere, nov. sp. 



Cythere virginea, Jones. 



concentrica, Eeuss. 



Cytherella Miinsteri, Horn. 

 Paracypris ?, nov. sp. 

 Cuttle-fish hooks. 



The Gault. — Organic remains of any size do not appear frequent in 

 these beds, though I noticed that several cores were put aside at the 

 brewery with Ammonites and Inocerami. Vegetable remains were 

 tolerably abundant ; amongst these were some jointed stems, not 

 unlike Baierce, but too imperfect for identification. The chief in- 

 terest of this section of the boring arises from its Microzoa, espe- 

 cially its Bhizopoda, the few samples I had having yielded about 19 

 genera and upwards of 30 species. Amongst these JBulimina and 

 Cristellaria are plentiful. Notwithstanding the myriads of Globi- 

 c/erina in the Chalk, I have found only a single specimen in all my 

 gatherings. 



The Entomostraca are also very abundant, of about thirteen spe- 

 cies ; and rarely there are single scutes of JScalpellum. The univalves 

 are represented by a few species of Turbo and Turritella, covered 

 with iron pyrites and too small to determine ; and amongst the Cepha- 

 lopoda I have met with a curious but perfect Hamites about the 30th 

 of an inch in diameter. There are a few small vertebrae and ribs and 

 teeth of small fishes, and a portion of a more elongate vertebra, which 

 may be reptilian. The specimens from the Gault arc usually in good 

 condition and of marine species. 



The whole of the Entomostraca have been revised by Professor 

 T. R. Jones. In the list he gives in the Geol. Mag. 1870, vol. vii. 

 pp. 74-77, he enumerates 28 British species from Cretaceous and 

 Neocomian beds. It is satisfactory, therefore, that from the beds 

 below the Chalk in the well-section I have obtained as many as 

 twenty species, four of which are new. 



Fossils from the Gault. 



Vegetable stems, Baiera ? 

 Spongia ? Ventriculites. 

 Bulimina Preslii, Eeuss, abundant. 

 Cristellaria rotula, Lam., do. 



cultrata, Mont. 



— — acutauricularis, Ficht. & Moll. 



Dentalina communis, JD' Orb. 

 Frondicularia complanata, Defr. 



strigillata. 



species. 



G-lobigerina cretacea, 72 Orb. 



? Haplophragmium inflatum, Eeuss. 



