CORALS FROM THE GAULT. 01 



CHAPTER VI. 



CORALS FROM THE GAULT. 



The Fossil Corals contained in the Ganlt are more numerous than those imbedded in 

 the upper greensand and the lower chalk. Most of them belong to the family of 

 Turbinolidae, and the principal localities where they have been met with in England arc 

 Folkstone and Cambridge. 



Family TURBIXOLIDyE (p. xi). 



Tribe CYATHINIX^ (p. xii). 



1. Genus Cyathina (p. xii). 

 Cyathina Bowerbankii. Tab. XI, fig. 1, 1 a, 1 h. 



Cyathixa Bowerbankii, Milne Edwards and J. Haime, Monogr. Turbin., in Ann. des Sc. 



Nat., 3 me serie, vol. ix, p. 292, 1848. 



Corallum simple, elongated, turbinate, very narrow, and slightly bent near the basis, 

 which does not appear to have expanded much. Wall quite naked. Costa? almost flat, 

 distinct from the basis, or nearly so, covered with small granulations, nearly equal, and 

 showing a slight tendency to form binary groups. Calice circular. Columella not much 

 developed, and composed of twisted blades. Septa forming four complete cycla ; very 

 thin, but slightly granulated, and rather unequal. Those of the last cyclum very little 

 developed, and the tertiary ones rather thickened towards the inner edge. Pali corre- 

 sponding to the penultimate cyclum of septa, and rather broad. Height of the coral, 

 eight or nine lines ; diameter of the calice, three lines and a half. 



This fossil was found in the Gault at Folkstone, by our friend Mr. Bowerbank. All 

 the specimens that we have seen were very incomplete, but some showed all the principal 

 characters represented in the figures which we have given. 



C. Bowerbankii is easily distinguished from C. Smithii and C. pseudoturbinolia, by not 

 having a fifth cyclum of septa. It differs also from C. arcuata by the delicacy of its septa, 

 and from C. Gwadulpensis by the circular form of its calice, and its round columella. 



