SUB-CLASS II HEX ACORALLA—A POROSA—ASTRAEIDAE 89 
costae granulated. Columella absent, dissepiments numerous. Cretaceous and 
Tertiary. 
Coelosmilia, E. and H. (Fig. 153). Like the preceding, but with dissepi- 
ments sparsely developed. Cretaceous and Recent. 
Placosmilia, E. and H. (Fig. 154). Cuneiform, base acutely pointed or 
slightly pedunculate. Calice laterally compressed, elongated. Septa numerous ; 
dissepiments abundant; columella foliaceous. Epitheca absent ; costae granu- 
lated. Cretaceous. 
Diploctenium, Goldf. Calice laterally compressed, greatly elongated in 
transverse direction, and bent downwards at the ends so as to become crescent- 
shaped. Columella and epitheca absent. Costae dichotomously or tricho- 
tomously furcate. Upper Cretaceous. 
Axosmilia, KE. and H. Jurassic. Phyllosmilia, From. Cretaceous. Lopho- 
smilia, E. and H. Cretaceous and Recent. 
B. Coralla multiplying by lateral gemmation. 
Placophyllia, @Orb. (Fig. 155). Buds originating on calicinal margin or 
sides, and giving rise to bushy or massive colonies. Columella styliform. 
Jurassic. 
Galaxea, Oken. Bushy colonies with cylindrical corallites united by layers 
of finely vesicular epitheca (peritheca). Recent. 
Stylina, Lam. (Fig. 156). Massive colonies, with corallites united by co- 
alescent costae. Septa well developed, disposed in six, eight, or ten cycles. 

Fic. 156. 
Placophyllia dianthus, Goldf. sp. Stylina Delabechet, E. and H, Coral-Rag ; Steeple 
Coral-Rag; Nattheim. «, Corallum, Ashton, England. oa, Natural size; ), Calices 
natural size ; b, Calice enlarged. enlarged. 
Dissepiments numerous ; columella styliform. Multiplication by costal gemma- 
tion. Profuse in Trias, Jurassic, and Cretaceous. 
Placocoenia, VOrb ; Cryptocoenia, E. and H. Jurassic and Cretaceous. 
Cyathophora, Mich. Massive colonies, with corallites united by costae. 
Septa short, not reaching the centre; columella absent. Visceral chamber 
partitioned off by horizontal tabulae. Jurassic and Cretaceous. 
Coccophyllum, Reuss. Massive colonies, with corallites united directly by 
their walls. Calices polygonal, septa numerous. Columella absent ; visceral 
chamber tabulated. Alpine Trias. 
Pinacophyllum, Frech. Triassic. : 
Holocystis, Lonsd. Massive colonies, with corallites united by costae. Four 
of the septa larger or stouter than the rest. Tabulae in visceral chamber. 
Cretaceous. 
