ALCYONAEIA OF SIND. 65 



Illustrations of the Species in Plate VI. 



Fig. 13. Upper part of coral: natural size. 



14. Side view. 



15. Calices : magnified. 



Genus ISASTE^A, if. Ed. & J. H. 



1. IsASTE^A IRREGULARIS, Duncan. Plate XIV, Fig. 1. 



The corallum is large, irregular in shape, convex above, and has a large peduncle 

 belovy, vs^here there is an epitheca. 



The calices are exceedingly variable in shape and size ; and this is irrespective of 

 the intramarginal gemmation which prevails. Some are irregularly oval or polygonal, 

 and these are the largest ; others are in hexagons or pentagons and are smaller. The 

 margins are united, and the septo-costse are rather wide there. The .calices are deep 

 about the edges ; but the floor of the fossa is often flat. The septa are not numerous, 

 and 18, 24, or 36 are the usual numbers, but when there are many very small septa there 

 are four cycles ; the primaries are the largest, and are short and straight, and sometimes 

 are swollen within ; and the others, especially the smallest kinds, unite with the larger 

 septa. Usually the septa are alternately large and small, and the smallest are often 

 crowded between the larger. The costal end of the septa is slightly swollen. A false 

 columella exists, produced by the inner termination of the septa, and in some calices it 

 is almost lamellar. The epitheca is plain. 



Breadth of corallum 3-4 inches ; length 4^-8 inches ; height If inch. 



Length of calices -yq to ys inch. 



Locality. Maliri, top of the Khirthar series or base of the Nari. Survey-number 



G302. 

 "9 2 • 



Illustration of the Species in Plate XIV. 

 Fig. 1. Some calices : slightly magnified. 



IsASTE^iEA IRREGULARIS, JDwican. Variety. Plate XIV, Fig., 2. 



A large, massive corallum, covering many square inches, gibbous more or less on 

 the surface, and about from 1 to 3 inches thick. The calices are smaller and more regular 

 than in the type, and the principal septa are of uniform breadth from the broad and 

 often granular margin to the false columella. 



Locality. Maliri, top of the Khirthar group or base of the Nari. Survey-number 



Illustration of the Variety in Plate XIV- 

 Fig. 2. Some calices : magnified. 



Genus PTEEASTE^A, M. M. & J. E, 



1. Pterastr^a mieabilis, Duncan. Plate V, Figs. 7, 8. 



The corallum is massive, and more or less incrusting in its habit ; it is rather irre- 



