CORALS FROM THE GAULT. 67 



and have lost their walls ; we are, therefore, unable to characterise the species with 

 any degree of precision, and it is with much doubt that we refer it to the genus 

 Trochocyathus, for we are not as yet sufficiently satisfied as to the existence of pali. 

 M. Michelin is of opinion that these fossils are merely specimens of Trochocyathus conulus 

 with their basis worn away. They are of a conico-convex form, and are broader in 

 proportion than T. Harveyanus, to which they bear, however, great resemblance. Their 

 height is about four lines, and their diameter a little more. We have not considered 

 it necessary to give a new figure of these corals, for the specimens in our possession do not 

 show anything more than those represented in Dr. Mantell's plates. 



The specimens that we have had an opportunity of examining were found in the Gault at 

 Folkstone, in the environs of Boulogne-sur-Mer, at Wissant, at Les Fiz, near Chamounix, 

 and at the Perte du Rhone, in the department of the Ain. According to Dr. Mantell the 

 same species is met with at Lewes in Sussex, and Godstone in Surrey, at Mailing in 

 Kent, in Cambridgeshire, 1 at Ringmer, and at Bletchingley. 2 



Trochocyathus (?) Warburtoni. 



We are inclined to think that a cast found in the Gault of Cambridgeshire by 

 Mr. H. Warburton, and presented by that gentleman to the Museum of the Geological 

 Society, must belong to a distinct species of Trochocyathus. It is about six lines in 

 height, and seven in diameter ; the number of septa is forty-eight. For the sake of 

 convenience we have given a specific name to it, but we are not able to characterise it. 



4. Genus Bathycyatiius (p. xiii.) 

 Bathycyathus SowfRBYi. Tab. XI, fig. 2, 2 a. 



m 



Bathycyathus Sowbubyi, Milne Edwards and J. Haime, Monogr. des Turbiuolides, Ann. 



des Sc. Nat., 3 me serie, vol. i.x, p. 295, 1848. 



Corallum simple, adherent by a broad basis, straight, tall, compressed, and having its 

 lateral edges somewhat prominent. Wall delicately granulated. Costa not very distinct 

 in the lower half of the corallum, but becoming rather prominent higher up, especially 

 those of the first and second orders. Calico elliptical and horizontal, the relative length 

 of its long and short axis varying much (in one specimens 100 : 170, and in another 

 =z 100 : 250). Fossula narrow, and appearing to be deep, but completely filled up with 

 extraneous matter in all the specimens that w r e have seen, so as not to enable us to obtain 

 any knowledge respecting the columella and the pali. It is therefore with some uncertainty 

 that we refer this species to the genus Bathycyathus, and in doing so we have been guided 



1 Geol. of Sussex. -' Trans, of the Geol. Soc., s. 2, vol. iii, p. 210. 



