328 PEOCEEDINGS 01? THE GEOLOGICAL SOCIETY. [JunC 19, 



the space which ought to have been filled by it was noticed to be 

 occupied by tabula?. This was clearly an Aulophyllum, but it differed 

 from Aulophyllum fungites and A. BowerbanJci as described by Milne- 

 Edwards and Jules Haime. 



We propose to form a new genus which will admit the species 

 with a columella. Thus Aulophyllum fungites will become Gyclo- 

 phyllum fungites, Fleming, sp., and A. BowerbanJci will be called 

 Oyclophyllum BowerbanJci, Edw. and Haime, sp. The new form 

 will be named AulopJiyllum Edwardsi, Dune, and Thomson. 



M'Coy suspected that the AulopJiyllum of Edwards and Haime 

 had a columella, but he mistook the general anatomy of the calicular 

 structures : he named the genus ClisiopJiyllum, or rather did not 

 separate it from ClisiopJiyllum. The genus ClisiopJiyllum has a 

 lamellar columella, and the larger septa are continued over the 

 central space of the calice. The AulopJiyllum of Edwards and Haime 

 was determined from imperfect specimens of two species whose calicos 

 were wanting. A circle of small septa, surmounting a central 

 columnar mass which was separated from the inner ends of the large 

 external or true septa, was considered very characteristic. The 

 absence of the columella and the paucity of tabulse were considered 

 generic. 



Our specimens prove that the species included in AulopJiyllum 

 by Edwards and Haime had deep calicos, and laminate septa spring- 

 ing from the epithecal wall externally, some reaching far towards 

 the circle of smaller septa, and others passing but a short distance 

 in the same direction ; that the small circle of septa bounded a very 

 complicated and more or less essential columella, and that the 

 endotheca was developed in an extraordinary manner. 



2. Description of tJie genus Oyclophyllum and its species : — 



Otclophyllum, gen. nov. 



The corallum is simple, tall, cornute, or more or less cylindrical. 

 The wall is very thin and is formed of epithecae. The calice is deep, 

 and its margin sharp; there is a central projection at the bottom of the 

 fossa, separated from the ends of the larger septa by a deep groove. 

 This central mass consists of an endothecal covering, with numerous 

 septa attached to it internally, and coalescing to form some large 

 septa, which ramify over the central depression which represents the 

 top of the columella. 



The columella is essential, and is made up of laminae which arise 

 from the base of the corallum, and from the dissepiments which 

 unite them. The endotheca is largely developed and the septa are 

 very numerous. There is a fossula with three small septa in it, and 

 a process of the endotheca of the central mass projects into it. 



1. Otclophtlltjm Boweebanki. pi. XIII. figs. 1-3. 

 AulopJiyllum BowerbanJci, Edwards and Haime *. 

 The corallum is long and subcylindrical. The central mass is 

 very prominent at the bottom of the deep fossa, and it is separated 

 from the ends of the septa which arise from the wall by a fold of 

 ^ Brit. I^oss. Corals, Pal. Soc. p. 189. 



