100 



COELENTERATA— ANTHOZOA 



THYLUM II 



Coelosmilia E. and H. (Fig. 151). Like the preceding, but with dissepi- 

 ments sparsely developed. Cretaceous and Kecent. 



Placosmilia E. and H. (Fig. 152). Cuneiform, base acutely pointed or 

 slightly pedunculate. Calice laterally compressed, elongated. Septa numerous ; 



Fig. 150. 



Trochosmilia granifera Haime. Turoiiian ; Bains-de- 

 Rennes, France, a, Profile ; b, Calice slightly enlarged 

 (after Fromentel). 



Fig. 152. 



Fig. 151. 



Coelosmilia laxa E. 



and H. White Placosmilia cuneiformis E. 



Chalk ; Lüneburg, and H. Upper Cretaceous ; 



Hanover. Natural St. Gilgen on Wolfgangsee, 



size. Anstria. Natural size. 



dissepiments abundant ; columella foliaceous. Epitheca absent ; costae granu- 

 lated. Cretaceous. 



Diplodenium 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. 



Axosmüia E. and H. Jurassic. Fhyllosmilia From. Cretaceous. LopJio- 

 smilia E. and H. Cretaceous and Eecent. 



ß. Coralla muUiplying hy lateral gemmation. 



Placophyllia d'Orb. (Fig. 153). Buds originating on calicinal margin or 

 sides, and giving rise to bushy or massive colonies. Columella styliform 

 Jurassic. 



Fig. 153. 



Placophyllia dlanthus (Goldf.). Coral- 

 Rag ; Nattheim. a, Corallum, natural 

 size ; b, Calice enlarged. 



Stylina delabechei E. and H. Coral-Rag ; Steeple 

 Ashton, England, a, Natural size ; b, Calices en- 

 larged. 



Galaxea Oken. Bushy colonies with cylindrical corallites united by layers 

 of finely vesicular coenenchyma. Recent. 



Stylina Lam. (Fig. 154). Massive colonies, with corallites united by 

 coalescent costae. Septa well developed, disposed in six, eight, or ten cycles. 

 Dissepiments numerous ; columella styliform. Multiplication by costal gemma- 

 tion. Profuse in Trias, Jurassic, and Cretaceous. 



