112 PEOF. p. MARTIN DTTNCAJir's EETISION 01" THE 



Genus Contexastr^a, cVOrligny, Note sur les Polyp, foss. p. 9 

 (1849). Illustrated by Milne-Edwards & Jules Haime, 

 Brit. Foss. Corals, Pal. Sec. pi. 23. figs. 5 & 6, and Hist. Nat. 

 des Corall. vol. ii. p. 277 (1857). 



Colony convex, gibbous, or dendroid. Corallites united by 

 their well-developed costee. The walls are cylindrical, and their 

 calicinal margin is hidden by the septo-costa3, whicli are few in 

 number, straight, exsert, and slightly granular. The septa are 

 few in number, continuous with the costse, and these last do not 

 all reach from calice to calice, and there is often an intercalicular 

 furrow. There is no columella. 



Distribution. — Fossil. Trias : Europe. Oolite : England and 

 Europe. 



Tribe II. 

 Grenus Adelastr^A, Heuss, DenkscJir. der Wien. AJcad. der Wiss. 

 t. vii. p. 115 (1854), correcting the name Gonfusastrcea, 

 d'Orb. ; and Milne-Edwards & Jules Haime, Pol. foss. des 

 Terr. pal. p. 98 (1831). 

 Syn. Gonfusastrcea, d'Orb, 



Colony massive, with a plane or convex surface. Corallites 

 intimately united by their costse, which sometimes are confluent. 

 Calices large and very slightly projecting, shallow, with margins 

 rounded off, resembling circular bourrelets. Walls of calices 

 rudimentary. Polygonal grooves between the calices indicating 

 the junction of coraUites. Septa well developed and uniting by 

 their inner edges without the intervention of a columella. 



Distribution . — Fossil. Trias : Europe. Oolite : Europe, Eng- 

 land ? Cretaceous : Europe. 



The unclassical word Gonfusastrcea was abolished by Eeuss. 



V. Alliance CYATHOPHOROIDA. 



Massive Astrseidse, increasing by gemmation. Corallites separated by 

 coenenchyma or exotheca. Columella absent or present. Dissepiments 

 or transverse tabulae. 



Genus Cyathophora, Mich. 



Genus Akeacis, Ed. & H. 



Genus Psammophora, E, de From. 



Grenus Cyathophora, Michelin, Icon. Zooph. p. 104 (1843), 

 amended. 



Colony massive, convex. Corallites united by their costaa and 



