140 A. Alcock — Neu'ly-recorded Corals from the Indian Seas. [No. 2, 



the margin of the calicle, where they are broad, finely granular and in all 

 respects uniform. 



The circular calice is open and moderately deep, with the marginal 

 axes ou the same plane. 



The septa, which are in six systems, are exsert, with blunted slight- 

 ly crenulated edges -and distantly granular surfaces. Those of the first 

 cycle are particularly distinct, being larger and stouter than those of 

 any of the other cycles, projecting more into the calicle, and being 

 more exsert beyond the margin. The quaternaries unite with the 

 tertiaries near the columella. The pali have the form of stout granular 

 pinnacles in three crowns, decreasing in size from without inwards, 

 before all the septa but those of the last cycle. 



The columella is small circular and slightly concave, and consists 

 of nuTuerous crowded granules. 



In the type specimen the height of the corallum is 12*5 mm., the 

 diameter of the calice 105 mm., and the diameter of the peduncle 7 

 mm. 



The septa and pali are of a permanent tawny-brown colour. 



Tin' Bpecimens in the Museum came from the telegraph cable in the 

 mi Gulf. 



Tin- distinctive characters of this species are the marked predomi- 

 nance of tlif primary septa, and the definition and regularity of the 

 pali. 



6. Paracyathus porphyreus, n. sp. Plate V, figs. 3. 3a, near Para- 

 cyathus pulchellus, Edw. & H. 



Coralhim with an encrusting base, above which it is suddenly 



I ricted to again gradually expand into a slightly drooping, turbinate 

 calice. 



Costa? distinct from the base, equal, finely granular, depressed. 



The calice is slightly elliptical, with marginal axes almost on the 

 same plane : it is deep, but its cavity is about two-thirds filled by the 

 septa. 



The septa, which are crowded and exsert, are in four complete 

 cycles in the young, with an incomplete fifth cycle in older examples : 

 they have sharp and slightly crenulated edges and coarsely granular 

 surfaces : those of the first two cycles are the most exsert : those of the 

 fourth cycle unite with those of the third deep down in the calice 

 behind the outer crown of pali. 



The pali, which are in two crowns, are tall and large, those which 

 stand opposite the tertiary septa being much the largest; the two 

 crowns of pali, as seen from above, form a broad ring within the calico, 

 very distinctly delimited both from the septa and from the columejla. 



