80 



PEOF. P. MAUTm Driq^CAN's EEYISION OP THE 



exception of the last. The walls are naked, and have distinct 

 granular costae along their whole length. 

 Distribution. — Fossil. Cretaceous : Europe. 



Grenus Hymenophtllia, Milne-Edwards ^ Jules Blaime, Hist. 

 Nat. des Corall. vol. ii. p. 368 (1857). 



Colony in the form of a fasciculate tuft. Corallites free at 

 their sides, and environed by a complete epitheca, which is 

 attached to the extremity of the cost-sB at a little distance from 

 the wall, giving an appearance of a double wall. Calices broad, 

 more or less deformed. Columella rudimentary or none. Septa 

 in irregular cycles, with a paliform lobe. Endotheca very deve- 

 loped. 



Distribution. — Fossil. Cretaceous : Europe. 



Genus E-habdophtllia, Milne-Ddiuards ^ Jules Saime, Hist. 

 Nat. des Corall. vol. ii. p. 348 (1857), amended. 



Colony in the shape of a dendroid tuft; the corallites long and 

 cylindrical in shape, bifurcating fissiparously and at different 

 angles. The calices have rather irregular shapes, and the colu- 

 mella is spongy and well developed. The septa are dentate and 

 granular. The costse are continued over tlie wall to the base, and 

 are distinct and granular, may be restricted to the neighbour- 

 hood of the calice, or some are very distinct low down. The 

 endotheca is developed, and there is no e23itheca. 



Distribution. — Fossil. Trias, Cretaceous : Europe. Jurassic : 

 England and Europe. Eocene : Europe and Asia. 



This genus absorbs Aplophyllia, d'Orbigny, 1849, which, being 

 less well known, had better not receive the usual priority. 



II. AUiance THECOSMILIOIDA. 



Astrseidae more or less csespitose, sometimes submassive. Corallites 

 united to some extent, increasing by fissiparity, speedily separating, showing 

 short series rarely; gemmation may occur. 



Genus Thecosmilia, Ed. & H. 



Subgenus Cladophyllia, Ed. & H. 

 The genus Cladophyllia becomes a subgenus, and Coenotheca, Quen- 

 stedt, is abolished. 



Some of the genera now about to be considered are verj diffi- 

 cult to classify, especially Thecosmilia, Ed. & H. The young 



