106 



COELENTERATA— ANTHOZOA 



PHYLUM II 



circular. Septa numerous ; the six priiicipal septa extending to the centre, 

 the remainder with fused inner edges. Cretaceous and Tertiary. 



^^ Dendrophyllia Blv. (Fig. 167). Corallum 



branching, increasing by lateral gemmation. 

 Calices oval ; septa numerous and slender, those 

 of the last cycle extending to the spongy 

 columella, and fused with the converging ends 

 of shorter septa of preceding 

 cycle. Tertiary and Recent. 



Lohopsammia, Stereopsammia 

 Edw. and H. Eocene. Astroides 

 E. and H. (Fig. 97). Kecent. 



Family 3. Poritidae Dana. 



Composite coralla composed of 

 porous sderenchyma. Corallites 

 small ; septa as a rule only moder- 

 Fio. 167. ately numerous, sometimes repre- 



DendrophyUia elegans Duncan. Oligocene ; Brockenhurst, Seuted by TOWS of trabeculae OT 

 England, a, Corallum, natural size ; b, Transverse section of 7 77 m. i 1 



caiice, eniarged, iameUae. I fieca aosent. 



Subfamlly A. Spongiomorphinae Frech. 



Corallum composed of thicJc trabeculae and strengthened by horizontal synapticulae. 

 Calices very imperfectly differentiated from coenenchyma, and without distinct septa. 

 Dissepiments usually sparsely developed. 



Of the genera belonging to this subfamily, Spongiomorpha, Heptastylis and 

 Stromatomorpha Frech, are found in the Alpine Trias (Rhaetic and Zlambach 

 beds). These are all tuberous, composite coralla of extremely irregulär form. 

 In Spongiomorpha and Heptastylis, six septa are indicated by somewhat regularly 

 disposed columns of trabeculae ; and in the latter form these are bound 

 together by synapticulae which are projected at equal altitudes, and form 

 perforated horizontal storeys. In a b 



Stromatomorpha no radial arrange- 

 ment of the trabecular septa exists. 



Palaeacis E. and H. (Sphenopo- 

 terium Meek and Worth.), occurring 

 in the Lower Carboniferous limestone 

 of North America and Scotland, per- 

 haps also belongs here. 





Fig. 168. 

 Adinacis elegans Reuss. Upper Cretaceous ; Gosau 

 Valley, Salzkaramergut. a, Upper surface, natural size ; 

 h, Transverse section, eniarged ; c, Longitudinal section, 

 eniarged (after Reuss). 



Subfamily B. Poritinae Milne Ed- 

 wards and Haime. 



Septa not very numerous, well developed. 

 Corallites united by their porous walls. 



Litharaea E. and H. (Fig. 169). Massive coralla. Calices sub-polygonal, 

 septa generally in three cycles ; columella spongy. Eocene and Miocene. 



Rhodaraea E. and H. Massive coralla. Spurious walls of corallites thick ; 

 pali prominent. Miocene and Recent. 



