100 PEOF. p. MARTIN Duncan's revision of the 



extent. Columella lamellary. Septa non-exsert, irregular, entire. 

 CostsB visible near the calicos and over the common wall of tlie 

 peduncle. Peduncle growing by accumulation o£ layers of coenen- 

 chyma, by wMcli tbe corallites are separated. Endotbeca exists. 

 Increase by fissiparity. 



Distribution. — Fossil. Cretaceous : Europe. 



Tribe II. 



Genus Eavia, Ohen, Lehrh. derNaturg.t. i. p. 67 {V^l^), amended; 

 Milne-Edwards Sf Jules Saime, Hist. Nat. des Gorall. vol. ii. 

 p. 426 (1857). 



Syn. Mscicella, Dana ; Ovalastraia, d'Orb. ; JSJllipsocoenia, 

 d'Orb. ; Thalamnccenia, d'Orb. ; Parastrcea, Ed. & H. 



Colony hemispherical, convex, lobed, rarely subplane, fixed, free or 

 inerusting. Corallites united by their costge and by a cellular exo- 

 theca. Calices variable in distance, with free margins, subcircular, 

 oval, deformed in outline. Th.e columella is spongy. The septa 

 are exsert, cross the wall, and the septo-costse unite with those of 

 other calices, or are separated by a groove. The septa are dentate, 

 and the inner teeth simulate pali. Endotbeca well developed. 

 Epitheca often exists. Increase by fissiparity, tlie resulting coral- 

 lites soon becoming separate. 



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

 Europe, England. Eocene and Miocene : Europe. — Becent. At- 

 lantic, Caribbean, Eed Sea, Indian Ocean, Pacific, Australian seas. 



G-enus Eavoidea, Reuss, Foss. Korall. von der Insel Java, 

 ' Novara ' Expedition, p. 168. 



Colony gibbous or flat on the free surface, massive. Calices 

 rather distant and irregular in shape, shallow. Columella absent. 

 Septa not numerous, unequal, spinulose, and usually thin ; they 

 extend beyond the calicular margin as costse, and gradually merge 

 into the ccenenchymal surface, not uniting with those of other 

 calices. A cellular exotheca between the corallites. Endotbeca 

 exists. Increase by fissiparity of the corallites at the calices. 



Distribution. — Fossil. Tertiary of Java ; and Miocene, West 

 Indies. 



Genus Babtphyllia, E. de Fromentel, Introd. a V etude des Polyp, 

 foss. p. 139 (1858-60). 

 Colony having a tall trunk, on the top of which the corallites 



