ALCYONAEIA OF SIND. 89 



swollen there, and always are alternately large and small and rather crowded, and there 

 are about 16 to ys inch. 



The length of the coUines is from less than a line to 1 inch, and the distance from 

 the top of one to that of its neighbour is under -^ inch. 



Length of the coral (a broken specimen) 10 inches, and the breadth is about 

 4 inches ; thickness 1^ inch. 



Locality. South-east of Bill, Gaj series. Survey-number G ^£-^. 



Illustrations of the Species in Plate XXVII. 



rig. 1. Part of the corallum: natural size. 

 2. CoUines : magnified. 



Genus HELIASTE^A, M. Ed. & J. H. 



1. HELiASTEiEA SiNDiANA, Buncan. Plate XXVII, Figs. 3, 4. 



The corallum is short and broad, irregular on its nearly plane upper surface, thin at 

 the more or less circular margin, and indistinctly pedunculate. The base expands rapidly ; 

 and is covered with a dense epitheca, on which costae are not seen. The calices, unequal 

 in size, are circular or slightly deformed in outline ; the margin is sharp ; the septa are 

 not exsert, but pass down into the deep fossa ; and the costse are feebly developed, and 

 do not pass down far on the outside, and not much on the intercalicular spaces. The 

 normal number of septa is four cycles ; they are alternately long and short ; all are 

 rather small, and the longer are often furnished with paliform teeth. In the smaller 

 calices there may be 24 or 36 septa ; but the alternate large and small septa are charac- 

 teristic. The columella is moderately well developed. 



Height of corallum If inch ; breadth 5 to 6 inches. 



Breadth of calices f to ^ inch. 



Locality. Magar Pir, near Karachi, base of Gaj series. Survey-number G ^^. 



Illustrations of the Species in Plate XXVII. 



Fig. 3. The corallum (a part of) : natural size. 

 4. Some calices : magnified. 



2. Heliastrjia digitata, Buncan. Plate XXI, Figs. 7, 8. 



The corallum is compressed, digitate, and covered with numerous crateriform 

 calices, the intermediate tissue being covered with costse. 



The truncated conical ends of the corallites are either symmetrical or oblique, and 

 the costEB are alternately large and small : the larger costae pass down the wall to 

 the intercorallite spaces. The calice is very shallow, and the columella very small. 

 The septa are very unequal : usually the six primaries are large and distinct, and the 

 six secondaries are smaller than they are, but larger than the short tertiaries. There 

 are often only twelve septa. The calice is often contracted, and the costae are larger 

 than the septa. 



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