1868.] JXJDD SPEETON CLAY. 233 



r. Ceritbium, sp. 

 r. Trochus, sp. 

 r. Ostrea frons, Park. 

 C. Exogyra sinuata, Bow. (typical 



form). 



c. (var. elongata, Leym.). 



C. Pecten cinctus, Sow, (gigantic 



form). 

 r. Lima, spec. nov. 

 r. Nucula obtusa, Sow. 

 K. Lucina sculpta, Phil. 



r. crassa, Sow. 



c. Pholadomya Martini, Forbes. 



r. , sp. 



c. Thracia Phillipsii, Bom. 



c. Panopaa Neocomiensis, Desk, sp, 

 r. Terebratula depressa ?, Lam.^ var. 

 ? Terebratula bippopus, Bom. 

 r. Waldbeimia Celtica, Morris, 

 r. Rbynchonella sulcata, Park, 

 c. Serpula filiforrais, Sow. 



c. antiquata, Sow. 



r. gastrocbsenoides, Zeyw. 



c. , sp. 



r. Vermicularia Pbillipsii, Bom. 

 r. Pentacrinus angulatus, Bom. 

 r. Pentacrinus, sp. 



Sponges. 



Cliona (crypts). 



Wood. 



In a paper which I had the honour of submitting to this Society 

 during its last session*, I showed that certain beds in Lincolnshire, 

 for which I proposed the name of the " Tealby Series," are of Middle- 

 Neocomian age, and also pointed out the correspondence which exists 

 between those beds and the portion of the Speeton Clay we are now. 

 discussing. This correspondence is especially seen in the abundance 

 in both these series of gigantic specimens of Pecten cinctus and Eoco- 

 gyra simtcita, as also by the presence of Belemnites jaculum, an un-. 

 described Ammonite {A. hipinnatus, Will. MS.), the same species 

 of Ancyloceras, with other fossils. It is true that the Clypeiform 

 Ammonites, which are so very characteristic of the Lincolnshire series 

 and some of its continental equivalents, have not hitherto, so far as 

 I am aware, been found in this division of the Speeton Clay ; but 

 so close is the correspondence in other respects that I. am sanguine 

 of these fossils being sooner or later discovered in the Yorkshire 

 beds. 



If we now turn our attention to the continental deposits which 

 appear from paleeontological evidence to be the equivalents of this 

 division of the Speeton Clay, that which claims our first attention is 

 the Hihthon of Hanover and Brunswick. The sections of these 

 strata being all inland, the succession of beds does not appear to 

 have been worked out in any detail ; but a reference to the de- 

 scription of this formation by M. Eomerf, and to that, of a later date, 

 by M. von StrombeckJ, will suffice to show its very close agreement, 

 with our second and third divisions of the Speeton Clay. As far as 

 can be judged from these descriptions, the upper part of the Hilsthon 

 represents the Middle Neocomian, and is the equivalent of the beds 

 at Speeton which I have just described. The lower part of the 

 Hilsthon and the whole of the Hilsconglomerat, on the other hand, 

 seem referable to the Lower Neocomian, and correspond to the third 

 division of the Speeton Clay. 



In the thin belt of Neocomian strata which surrounds the Paris 

 basin, and has been made known to us by the admirable researches 



♦ Quart. Journ. Geol. Soc. vol. xxiii. p. 227. 

 t Verst. nordd. Kreide (1840^1). 



I Ueber die Neocomien-Bildung, &c. — Zeitschrift d. geol. Gesellscb. vol. i. 

 p. 462 (1«49) ; Leonbard und Bronn's Jabrb. Min. 1850, p. 230. 



S2 



