274 DR. J. W. GREGORY ON THE PALEONTOLOGY [Aug. 1895, 



Some of the specimens collected by Mr. Jukes-Browne at Castle 

 Grant are extremely well preserved. Others, however, are much 

 worn ; the septa in these having been removed, the corals look 

 like Cyphastrcea, in which genus I was at first inclined to include 

 them. More careful study of vertical sections shows that the septa 

 are not cribriform, though very brittle. The corallites present two 

 different aspects : in one the thecal wall and costa? are thin ; in 

 another group from the same slab both these elements are coarse 

 and thick. PL XI. figs. 4 a, 4 b, show the very different ap- 

 pearance which these present. 



Genus Cyphastrjea, M. -Edwards & Haime, 1848. 

 Species Cyphastrea costata, Duncan. 



Synonymy : — 



Cyphastrcea costata, Duncan, 1863, ' Foss. Cor. W. Ind.' pt. i., Quart. Journ. Geol. 

 Soc. vol. xix. pp. 436, 441, 443 ; id. 1865, ' Foss. Cor. Jam.' ibid. vol. xxi. p. 7 ; 

 Duchassaing & Michelotti, 1866, ' Suppl. Mem. Cor. Ant.' Mem. R. Accad. Sci. 

 Tor. ser. 2, t. xxiii. p. 180: Duchassaing, 1870, 'Rev. Zooph. Ant.' p. 30. 



Cyphastrcea oblita, Duchassaing & Michelotti, 1861, 'Mem. Cor. Ant.' Mem. 

 R. Accad. Sci. Tor. ser. 2, t. xix. p. 353 ; iid. 1866, ' Suppl. etc' p. 180 ; Duchas- 

 saing. 1870, ' Rev. Zooph. Ant.' p. 30 ; Quelch, 1886, ' Reef Corals,' Zool. ' Chall.' 

 Exped. pt. xlvi. p. 12. 



Distribution. Recent : St. Thomas, West Indies. Fossil : Barbados : High- 

 level Reefs ; Castle Grant, 1070 feet ; Groves, 650 feet ; Low-level Reefs, near Bridge- 

 town. San Domingo, Nivaje Shale ; Jamaica ; Barbuda. 



Notes on Synonymy. — This species has been well described by 

 Duncan from a specimen from Barbuda. It was named by 

 Duchassaing & Michelotti two years previously ; but they gave 

 so inadequate a diagnosis that their name has no claim to pre- 

 cedence. The coral looks at first sight much like Orbicella acropora 

 (L.), from which it may be distinguished at once by its thicker thecal 

 walls and more cellular exotheca. The whole aspect of the coral is 

 coarser and looser. The cribriform nature of the septa is extremely 

 well marked. Following Duncan, but differing from Klunzinger 

 and Quelch, I prefer to keep Cyphastrcea and Solenastroea distinct. 



Genus Echinopora, Lamarck, 1816. 

 Species Echinopora Eranesi, sp. n. 



Diagnosis. The coral has a broad base ; from this pass outward 

 short, thick, rapidly tapering expansions. 



Corallites long : often an inch in length. Their distance one 

 from the other varies from half their diameter to the whole. 



Septa strongly dentate ; inner teeth paliform, in three cycles. 

 Those of the first cycle always unite to the columella ; those of the 

 second cycle often do so, but may join the primary septa ; those of 

 the third cycle are much smaller and independent, but a few may 

 unite with the septa of the other orders. 



Columella of very loose tissue ; half the diameter of the corallite. 



