20 PKOCEEDrffGS or the geological society. [Dec. 4, 



and small ; and the reproduction is principally by fissiparity through 

 the solid columella, and occasionally by marginal gemmation. 



Lamellastr^a SiiTTHi, spcc. uoT. PI. I. figs. 2 a, 2 h. 



The corallum is large and massive. The coraUites vary in size, 

 from their undergoing fissiparous division. The "^alls are sohd and 

 delicate. The septa are short, alternately large and very small, 

 although a small septum often separates tvro smaller. The larger 

 septa are broadest at the wall, and have a paliform tooth near the 

 columella, and they reach further inwards than the smaller septa. 

 The smaller septa are linear. The columella is stout, more or less 

 lamellar, and a portion of it remains as a large septum after fissi- 

 parity. The number of large septa varies, but in small calices 

 twelve may be counted. The endotheca is scanty. 



Diameter of longest corallites undergoing fissiparity about -I- inch ; 

 diameter of the smallest corallites y\^ inch. 



Loc. Antigua, probably from the Marl (Coll. Brit. Mus.). 



This genus is readily distinguished by the lamellar columella, the 

 want of pali, and the fissiparous division. It must be classified 

 amongst the Faviacece, and placed between the genera Favia and 

 Goniastroea. 



PaVOIDEA JuJ^GHUHIfl, Reuss. 



A specimen of the genus Favoidea of Eeuss (Ueber fossile Ko- 

 raUen von der Insel Java, p. 168) presents corallites slightly larger 

 than the type, and the septa appear slightly larger at the wall ; but 

 there is no specific difi'erence between the type and the specimen 

 which I found in the collection of West-Indian fossil corals in the 

 British Museum, and whose mineralization would lead me to believe 

 was Antiguan. The type is from the Miocene (?) of Java, whose 

 corals have been so ably described by Eeuss. 



Sttloccekca lobato-eotttis^data, Ed. & Haime. 



This coral is very common in the Chert of Antigua. The general 

 affinities of the species are described by me in the Geological Magazine, 

 InTo. 3. It is a common Maltese coral. 



Aste^a geandis, Duncan. 



A specimen of this coral, in the form of a polished section, is in 

 the British Museum. The weathered edges present a most extraor- 

 dinary appearance, and the coral there has every appearance of a 

 Thamnastrcea ; but the continuity of the septa, and their curved 

 nature, can be readily understood by examining the polished sui'faces 

 and by comparing them with the weathered surfaces of a Jamaican 

 Astrcea grandis. 



Diploccejtia, gen. nov. 



The corallum is massive. The corallites are polygonal and tall, 



united by a well-developed common wall, and present an external 



coenenchymal space, an internal wall, whence arose the septa, a 



lamellar columella, and oblique dissepiments between the common 



