XXV1 BRITISH FOSSIL CORALS. 
10. Genus AXOSMILIA. 
Milne Edw. and J. Haime, loc. cit., p. 261, 1848. 
Corallum simple, free in the adult state, tall, turbmate. Ca/ice circular ; fossula large and 
deep. Columella styliform, large, and slightly compressed. Sep¢a neither exsert nor crowded, 
delicately granulated, and all, excepting those of the youngest cyclum, cemented to the 
columella ; loculi deep. Wadls entirely covered by a membraniform epitheca, presenting 
strong transverse folds, and extending to the edge of the calice. 
Typ. sp., Avosmilia extinctorium, Milne Edw. and J. Haime, loc. cit.; Caryophyllia extinctorium, 
Michelin, op. cit., tab. ix, fig. 3°. 
ll. Genus EvsMitia. 
Milne Edw. and J. Haime, loc. cit., p. 262, 1848. 
Corallum composite, cespitose, with dichotomous or trichotomous branches, and a stem 
that does not thicken much by the progress of age. Cora/lites multiplying by fissiparity, 
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. Co/wmella of a 
loose lamello-spongiate texture. Septa exsert, broad, thin, straight, not crowded, with their 
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. Coste 
indistinct towards the basis of the corallites, but becoming sub-cristiform near the calice. 
Typ. sp., Lusmilia fastigiata, Milne Edw. and J. Haime, loc. cit., tab. v, fig. 1 ; Madrepora fastigiata, 
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, 1848. 
Corallum composite, cespitose, fissiparous, and presenting the same general disposition as 
in the preceding genus. No columella. Septa extremely thin, crowded, broad, very slightly 
exsert, with their apex slightly arched, and their lateral surfaces sub-glabrous. Dissepr- 
ments very abundant. Wadls very thin, plain towards the basis, and costulate near the 
calices. 
Typ. sp., Leptosmilia ramosa, Milne Edw. and J. Haime, loc. cit., tab. vi, fig. 1. 
14. Genus THECOSMILIA. 
Milne Edw. and J. Haime, loc. cit., p. 270, 1848. 
Corallum composite, cespitose, fissiparous, and affecting the same general disposition as 
