COBLENTEEx\— COEALS. 



57 



Parasmilia is elongate and cylindrical. Oncliotroclmis ser- Gallery X. 

 pentinus is as narrow and sinuous as a worm-tube. Other Table-eases 

 forms are discoid, such as Cyclocyathus Fittoni from the Gault, 

 Trochocyatlius Harveyanus from the Cambridge Greensand, 

 and Micrctbacia coronula from the Chalk. Gorgonians are 

 represented in the Chalk by Axogaster cretacea. The series 

 of corals from the Upper Greensand of Haldon in Devonshire, 

 recently enriched by the Vicary Collection, contains many 

 specimens described by P. M. Duncan in a Monograph of the 

 Palaeontographical Society. Here may be noticed Haldoiiia, 

 Placosmilia, and excellent specimens of Heliopora. The 

 Foreign Jurassic and Cretaceous collections chiefly illustrate Wall-eases 

 the faunas of Central Europe. 



Among the British Cainozoic corals the Eocene and Table-case 

 Oligocene fauna is separated from that of Pliocene age. 

 Here first appears the family of reef-building Zoantharia 

 Perforata, the Poritidse (Fig. 21 c), of which a Catalogue by 



Fig. 27. — Perforate Zoantharian corals from the Lutetian of Bracklesham. 

 a, Turhinolia Dixoni ; b, Dendrophyllia denclrophylloides ; c, Goniopora 

 Websteri. Natural size. (From Prestwich's " Geology.") (See Table- 

 case 1.) 



H. M. Bernard has been published. Stephanoijhyllia, Den- 

 drophyllia (Fig. 27 h), and Balanophyllia are also Perforata. 

 The adjoining Stylocoenia is an Astraeid. Then come the 

 characteristically modern Turbinolidae (Fig. 27 a), and the 

 branching Omlina. Alcyonaria are represented by the axis 

 of a sea-pen named GrapJmlaria Wetherelli, and by the 

 gorgonians Wehsteria and Moi^sea, allied to Isis. The 

 Pliocene Crags have yielded a few small corals of no great 

 interest. The foreign series of Cainozoic corals includes Wall-cases 

 representatives of the Indian faunas and many type- 1 & 2. 

 specimens of species from the West Indies. 



In illustration of the rock-forming activities of corals 

 there is placed in the centre of this Gallery a Case with 

 specimens of the core obtained by a deep boring on the coral 

 island of Funafuti, and other specimens showing the rate of 

 growth of various corals. 



