52 BRITISH FOSSIL CORALS. 



2. Genus Ccelosmilia (p. xxv.) 



Ccelosmilia laxa. Tab. VIII, fig. 4, 4 a, 4 5, 4 c. 



Corallum simple, turbinate, slightly bent, rather intermittent in its growth, and 

 appearing to have been adherent. Costa distinct from the basis to the calice, very distant 

 from each other ; those belonging to the first three cycla subcrestiform ; those of the last 

 cyclum flat and scarcely visible, delicately granulated and crossed by small horizontal 

 striae. Calice circular ; fossula narrow and rather deep. No columella. Septa forming 

 four complete cycla ; but those of the last cyclum almost rudimentary. The six systems 

 equally developed. The septa very unequally developed, broad, very exsert; thin, but 

 rather less so near the inner margin, presenting a few round granulations on their lateral 

 surfaces. Those of the first and second cycla united along the lower part of their inner 

 edge. Height, from one inch to one inch and a half; diameter of the calice, seven lines. 



We have given the generic name of Ccetosmilia to a certain number of Eusmilina? which 

 we formerly placed in our genus Parasmilia, but which are characterised by the absence 

 of the columella and the rudimentary state of the endotheca. Parasmilia poculurn, 

 P. Faujasi, and P. punctata 1 belong to this group, and differ from C. laxa by their costae 

 being flat and granulated near the calice, whereas in the above-described fossil these parts 

 are subcrestiform. It is also to be remembered that in Ccelosmilia poculurn and C. Faujasi 

 the septa form five complete cycla, and that in the last-mentioned species, as well as in 

 C. punctata, the principal septa are much thicker than in C. laxa. M. Alcide d'Orbigny 

 has lately discovered in the white chalk of Cesanne a new species which he designates by 

 the name of Ccelosmilia Edwardsiana, and which differs from C. laxa by its costse being 

 rudimentary and its septa thinner. 



1 See our Monograph of tbe Astreidae (Ann. des Scien. Nat. 3 me serie, vol. x). It is possible that our 

 Ccelosmilia punctata may be only a young form of C. Faujasi, but we have not as yet seen a sufficient 

 number of specimens to be able to decide the question. 



