CORALS OF THE CRAG. 9 



The corallites penetrate almost perpendicularly to the surface of the celleporous mass, 

 and, when isolated from this extraneous body, present the appearance of small, subturbinate 

 cylinders, the walls of which are covered with a thick epitheca ; there is no trace of costae 

 visible, and the epitheca forms round the calice a small exsert rim. The calice is 

 circular, and its fossula large, but not deep. The columella is well developed, papillose, 

 and not projecting, nor is it placed exactly in the axis of the visceral chamber, the septa 

 being more developed on one side of the corallite than on the other. The septa of 

 different orders are nearly equal in size, and do not form well-characterised systems ; they 

 vary in number from sixteen to twenty, and consequently must belong to three cycla, the 

 first two of which are probably complete, and the third developed only in two or four of 

 the six systems normal in all Astreidse. It is also to be noted, that all these septa are 

 very thin excepting near the wall, closely set, slightly bent inwardly, and terminated by an 

 oblique edge, armed all along with strong dentations, the size of which increases towards 

 the columella. A few large granulae are seen on the lateral surfaces of the septa, and the 

 loculi are divided by very thin dissepiments, placed at a distance of about two thirds of a 

 line from each other. 



The length of these corallites, when adult, is about four lines ; the diameter of the 

 calice, one line and a half ; and the depth of the fossula, two lines. 



Cryptanyia parasita 1 of the Faluns of Touraine, is very nearly allied to the above- 

 described species, but differs from it by the small dimensions of its calices, and the 

 constant existence of eight principal septa. 



Cryptangia Woodii is found in a good state of preservation in the Coralline Crag at 

 Ramsholt. Specimens which appear to belong to the same species, but are not well 

 preserved, are met with in the Red Crag of Sutton. 



These fossils are to be seen in the collections of the Geological Society of London, 

 and of Messrs. Searles Wood, Bowerbank, D'Archiac, and Milne Edwards. 



Family EUPSAMMLDtE (p. li). 



Genus Balanophyllia (p. Hi). 

 Balanophyllia calycultjs. Tab. I, figs. 3, 3 a, 3 b, 3 c, 3 d. 



R. C. Taylor, Mag. of Nat. Hist. vol. iii, p. 272, fig. D, 1830. (Very 



rough figure.) 

 Balanophyllia calyculus, Searles Wood, Ann. of Nat. Hist., vol. xiii, p. 12, 1844. 



— — Milne Edwards and Jules Haime, Annales des Scien. Nat., 



vol. x, p. 84, 1848. 



Corallum simple, cylindrico-turbinate, adherent by a large basal surface, erect, and in 

 general not very tall. The walls, of a spongy tissue and rather thin, are covered in most 



1 Lithodendron parasitum Michelin Icon. Zooph., pi. lxxix, fig. 3. 



2 



