20 



BRITISH FOSSIL CORALS 



lar and sometimes as encnistiug forms. All are very irregular in their septal arrange- 

 ment, and none of them present definite and clear cyclical sequences. 



Some of the species have the ccenenchyma between the calices irregularly ridged, so 

 as to present the first traces of that coenenchymal development which characterises the 

 genus Styloccenia. The columella is very distinct in all the species, and the junction of 

 the largest septa to it is marked in some forms by a paliform swelling, but there are no 

 pali. In many species the smaller septa unite more or less to the larger, and in others 

 the dentate condition of the septal edge is very marked. The costae are either rudi- 

 mentary or well developed in different species; they may be straight, spined, and 

 wa\y. 



The size of the corallum, its shape and its habit, with the size of the calices, and the 

 character of the costae and of the cocnenchyma, appear to separate certain forms from 

 others and enable eleven new species to be classified with the Asfroccema. 



The following scheme of the structural peculiarities of the new Astroccenice will show 

 how readily their specific distinctions may be recognized : 



ASTROCCENIA. 



Corallum 



'large 



small 



gibbous and tall 



Astrocan 



a gibbosa. 



flat and short . . . . 



[ I 



plana. 







insignis. 



short, and irregular in outline . 





reptans. 



encrusting . . , . 





parasitica. 



pedunculate, with an epitheca . 





pedunculata. 



dendroid . . . . 





dendroideu. 



flat and narrow- 





superha. 



globose . . . . . 





favoidea. 



irregular . . . . 





costata. 



flat and semi-encrusting . 





minufa. 



scanty 



Corallum having the ccenencbyma . abundant 



moderately dcveloiied 



Astrocwnia favoidea. 



— minuta. 



— parasitica. 



— dendroidea. 



— super ba. 



— pedunculafo 



— insigiiis. 



— repfauf!. 



— costata. 



— gibbosa. 



— plana. 



