xxvi BRITISH FOSSIL CORALS. 



10. Genus Axosmilia. 



Milne Edw. and J. Haime, loc. cit., p. 261, 1848. 



Corallmn simple, free in the adult state, tall, turbinate. Calico circular ; fossula large and 

 deep. Columella styliform, large, and slightly coir pressed. Septa neither exsert nor crowded, 

 delicately granulated, and all, excepting those of the youngest cyclum, cemented to the 

 columella ; loculi deep. Walls entirely covered by a membraniform epitheca, presenting 

 strong transverse folds, and extending to the edge of the calice. 



Typ. sp., Axosmilia extinctorium, Milne Edw. and J. Haime, loc. cit. ; Caryophyllia extinctorium, 

 Michelin, op. cit., tab. ix, fig. 3 a . 



11. Genus Eusmilia. 



Milne Edw. and J. Haime, loc. cit., p. 262, 1848. 



Corallum composite, cespitose, with clichotomous or trichotomous branches, and a stem 

 that does not thicken much by the progress of age. Corallites multiplying by nssiparity, 

 becoming rapidly segregate, and not remaining disposed in series at their calicular extremity. 

 Calices rather irregular in form, but in general nearly circular ; fossula deep. Columella of a 

 loose lamello-spongiate texture. Septa exsert, b?'oad, thin, straight, not crowded, with then- 

 apex strongly arched, and their surface almost smooth. Dissepiments well formed, but not 

 very abundant. Walls naked or covered inferiorly by a slight pellicular epitheca. Costa 

 indistinct towards the basis of the corallites, but becoming sub-cristiform near the calice. 



Typ. sp., Eusmilia fastiyiata, Milne Edw. and J. Haime, loc. cit., tab. v, fig. 1 ; Madrepora fastiyiata, 

 Pallas, Eleuch. Zooph., p. 301. 



12. Genus Aplosmilia. 



D'Orbigny MSS. 



Corallum composite, and having the characters of Eusmilia, excepting that the columella 

 is lamellar. 



Typ. sp., Aplosmilia aspera, D'Orbigny MSS. ; Lobophyllia aspera, Michelin, Icon., tab. xx, fig. 4 ; 

 Eusmilia (?) aspera, Milne Edw. and J. Haime, loc. cit., p. 266. 



13. Genus Leptosmilia. 



Milne Edw. and J. Haime, loc. cit., p. 267, 184 c . 



Corallum composite, cespitose, fissiparous, and presenting the same general disposition as 

 in the preceding genus. No columella. Septa extremeb* tlrm, crowded, broad, very slightly 

 exsert, with their apex slightly arched, and their lateral surfaces sub-glabrous. Dissepi- 

 ments very abundant. Walls very thin, plain towards the basis, and costulate near the 

 calices. 



Typ. sp., Leptosmilia ramosa, Mdne Edw. and J. Haime, loc. cit., tab. vi, fig. 1. 



14. Genus Thecosmilia. 



Milne Edw. and J. Haime, loc. cit., p. 2/0, 1848. 

 Corallum composite, cespitose, fissiparous, and affecting the same general disposition as 



