1867.] DUNCAN — WEST-INDIAN CORALS. 19 



same may be said conceruing H. Bochettina, if it can stand as a sepa- 

 rate species. 



The species Astrcea cellulosa, Duncan, A. Antiguensis, Duncan, A. 

 endothecata, Duncan, A. megalaocona, Duncan, A. tenuis, Duncan, 

 A. Barhadensls, Duncan, A. costata, Duncan, A, radiata, Lamarck, 

 arc now to be referred to the genus Heliastrcea. 



Alveoiwra microscopica, Duncan, is probably Porites coUegniana, 

 Mich. 



Mceandrina JUograna, Esper, sp., is found in the Antiguan Ter- 

 tiary deposits. 



Heliaste^i^a insignis, spec. nov. PI. I. fig. 4. 



The corallum is large, and the corallites also; they are wide 

 apart, are circular in transverse outline, and are very equal in size. 

 The wall is stout as regards the septa and costse, but thin in com- 

 parison with the diameter of the corallites. The septa are delicate, 

 wide apart, long, slightly thicker at the wall than elsewhere, straight, 

 and the primary septa are hardly any broader than the tertiary. 

 There are three cycles of septa in the six systems, and rarely a septum 

 of the fourth cycle is noticed in half of a system. The primary and 

 secondary septa are of equal length, and the tertiary extend far in 

 towards the columella. The columella is small. The costae are long, 

 slender, often bent, almost equal, and of about the same thickness as 

 the septa ; occasionally a rudimentary costa is seen, and is not re- 

 presented by a septum. The exotheca is inclined and abundant. 

 The endotheca is very abundant and inclined. 



Diameter of corallites (costae not included) j^ inch. 



Log. Antiguan Tertiary deposits. 



The large size of the corallites, the low septal number, the long 

 septa and costse, with the small columella and highly developed 

 endotheca, distinguish this species. 



Stephanoccenia Reussi, spec. nov. PI. II. fig. 1. 



The corallum is gibbous and massive ; the corallites vary somewhat 

 in size, but are polygonal, and are separated by consolidated walls, 

 upon which the septo-costal ends are seen. The septa are distinct 

 and distant; there are ten large and ten small. The ten largest 

 septa either reach the columella, or are attached to large pali ; ordi- 

 narily five or six of the large septa have pali. The pali are long 

 and are broader than the septa ; sometimes two of the smaller septa 

 unite to a larger septum. Columella distinct and large. Young 

 corallites have evidently six systems ; but the third cycle is incom- 

 plete in all the larger corallites. 



Diameter of corallites -^-^ inch. 



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



Lamellaste^a, gen. nov. 



The corallum is compound ; the corallites are united by their 

 walls, and are more or less polygonal in transverse outline; the 

 columella is essential and lamellar ; the septa are alternately large 



c2 



