274 Mr. P. M. Duncan on the Corals of the Maltese Miocene. 



5. The hard Cherty Limestone. 



Stylocoenia lobatorotundata, Michelin, sp. Miocene of Rivalba, 

 Turin, Verona, Antiguan chert. 



Dendrophyllia irregularis, Blainville. Miocene of Dax. 



Porites inc?-ustans, Defrance, sp. Miocene of Turin, Dax, Tri- 

 nidad, San Domingo. 



Astr<ea {Heliastrcea), sp., in large casts. Clearly a Miocene 

 form. 



The specimens were sent to me by Dr. Leith Adams, having 

 been marked with the number of the beds whence they were 

 derived. Doubtless many other species will be found. 



Coenocyathus Adamsi, n. sp. PI. XI. fig. 1. 



A corallite broken off from the parent corallum presents an 

 ovoid mark of fracture, which is larger than the cylindrical 

 pedicel immediately above it. The corallite is tall, nearly 

 straight, and cylindrico-conical. The calice is not quite circular, 

 is very open, shallow, and characterized by the prominent trans- 

 versely ridged columella. The wall is stout, is marked by faint 

 costal projections for a short distance from the calice, but is, 

 with these, covered by a finely granular epitheca, which is 

 marked by some aborted buds. The septa in six systems of 

 four cycles ; the primary and secondary are equal, and extend 

 to the columella, but the primary are the most exsert; the 

 tertiary are larger than those of the fourth cycle. The laminae 

 are stoutest at the wall, are arched, and some become wavy near 

 the columella ; they are marked by sparse rows of granules. 

 The pali, which are on the primary and secondary septa, are 

 very small and indistinct. 



Height of corallite 1 inch ; width of calice -^ inch. 



This species is determined by the great development of the 

 columella and the smallness of the pali ; and it has but a very 

 remote affinity with C. costulatus, Reuss (Oligocene). The recent 

 species, which are all Mediterranean, are equally remote. 



Locality, Bed 2 (Adams), Malta. Coll. Geol. Soc. 



Astrcea [Heliastrcea) Forbesi, n. sp. PI. XI. fig. 2. 



The corallum is large, often covers a large space, and presents 

 a very uneven calicular surface. The growth of the corallites 

 appears to have been more or less intermittent in some specimens, 

 where the ccenenchyma exists at certain heights alone. The 

 corallites in the larger specimens are nearly parallel and nearly 

 cylindrical, and they vary in size somewhat ; usually they are 

 close, but not crowded ; and in certain spots on luxuriant speci- 

 mens they are evidently separated by some ccenenchyma. The 

 calices are circular in outline, are slightly and irregularly ele- 



