1867.] DUNCAN — WEST-INDIAN CORALS. 13 



is small, distinct, lax, and parietal. The costac are well marked, un- 

 equal, and rarely touch, and they are thicker than the septa. The 

 costae of the highest order arc well developed, and contrast with 

 their rudimentary septa. The septa are delicate, they are thinner 

 midway than elsewhere, and those which reach the columella have 

 a paliform tooth ; they are not exsert, and are only slightly dentate. 

 The septa are very irregular in their arrangement. There are six 

 systems, and in most of them there are three cycles with or without 

 a part of a fourth in one-half of the system, so that there are con- 

 stantly six septa in a system instead of eight. The endotheca is 

 well developed ; and the dissepiments are close, stout, and nearly 

 horizontally parallel. The exotheca is abundant, forming small cells 

 Avith arched outlines. Height of corallum 6-8 inches. Diameter of 

 calicos -^-ff inch. 



Locality. St. Croix, Trinidad. 



Brachyphtllia Eckeli, spec. nov. Plate II. fig. 4. 



The corallum is large, massive, and irregular. The corallites are 

 cylindrical, of various lengths, and are not always*parallel, neither 

 are they equidistant ; they are not free, but their calices are more or 

 less continuous by means of the costae. The walls are stout and 

 independent. The calices are large, and are of various depths, and 

 they do not rise as truncated cones ; but their interspaces are broad, 

 convex, and are traversed by the more or less continuous costae. The 

 columella is small, spongy, and prominent. The septa are numerous, 

 unequal, and crowded ; they are thicker at the wall than elsewhere, 

 are barely exsert, and are faintly dentate. They are usually forty- 

 eight in number. There are six systems and four cycles, and some 

 orders of the fifth sometimes exist. The doubly laminar condition 

 of the septa is very distinct. Most of the septa join the columella, 

 and those of the fourth and fifth orders frequently curve towards the 

 larger septa. The costae of the principal septa, and often those of 

 the others, touch or unite to the corresponding structures of the 

 neighbouring calices. The costae are not so unequal as the septa, 

 are faintly dentate, but slightly exsert, and are very distinct. The 

 endotheca is sparely developed, and the exotheca exists. Diameter 

 of calices -^ inch. 



Locality. St. Croix, Trinidad. 



Brachyphtllia irregularis, spec. nov. Plate II. fig. 5. 



The coraUum is short, and has a very irregular upper surface, and 

 an encrusting base. The corallites are very irregular in their shape 

 and dimensions. The calices are crowded, deformed, and irregular. 

 The calicular fossa is deep. The columella is very small. The costae 

 are continuous, and alternately very large and very small. The 

 septa are irregularly developed, are alternately large and small, and 

 never exceed three cycles in six systems. There is much exotheca. 

 The largest calices are rather more than ^^ i^ch in diameter. 



Locality. St. Croix, Trinidad. 



