SOLITARY CORALS. 201 



specimens vary between the following limits : Height 16 millims. to 12 millims. 

 Calicle from 16 millims. x 7 millims. to 14 millims. x 6 millims. Scar from 6 millims. 

 x 2 millims. to 7 millims. x 2*5 millims. (the smallest specimen has the largest scar). 

 Angle formed by the directive faces of the wall 33 to 40. They correspond exactly 

 with M. Edwards and Hatme's description, except that the directive faces of the 

 wall show only the merest traces of wing-like expansions, in this respect agreeing 

 with Semper's specimens. This appears to be a very rare species. It is remarkable 

 among the Flabellida? for the perfectly regular development of the septa, the first, 

 second, and third cycles are equal in size, and appear to form with the intermediate 

 quaternary and quinary cycles twenty-four regular systems (Plate I., fig. 5). 



Family : FUNGIID^E, M. Edwards and Haime. 

 Fungia (pars.) Lamarck. 



Fungia danai, M. Edwards and Haime (1851). 



Two specimens from the pearl banks, Gulf of Manaar, are referable to this species. 

 The larger specimen is subcircular, measuring 18 centims. x 19 centims., and the 

 central part of the upper surface is raised into a prominent convexity. The smaller 

 specimen has no central prominence, but is evenly convex above and concave below. 



Fungia dentig-era, Lettckart, 1841. 



A single specimen, measuring 16'5 centims. in length, 11 centims. in breadth, and 

 5"5 centims. in height. According to Doderlein this is a variety of F. scutarta, 

 Link, but Gardiner (20) has given a sufficient criticism of this author's varieties. 



Locality : Gulf of Manaar. 



Cycloseris, Michelin (}3ars.) (34). 



Cycloseris cyclolites, Lamarck 



Fungia cyclolites, Lamarck, 'Hist, des Anim. sans Vert.,' ii., p. 236, 1816. 

 Cycloseris cyclolites, M. Edw. and H., 'Ann. des Sci. Nat.,' 3 e se>., xv., p. 112, 1851. 



Professor Herdman's collection contains thirty-two specimens of this species, 

 twenty-five of which come from the pearl banks in the Gulf of Manaar, four from 

 south of Modragam, one from off Mutwal Island, two from Trincomalee. The range 

 of variation in this species is considerable. In the thirty-two specimens the diameter 

 of the corallum varies from 42 millims. to 27 millims., the height from 19 millims. 

 to 10 millims., the depth of the basal concavity from 9 - 5 millims. to 1 millim., the 

 length of the fossa from 15 millims. to 6 millims. There is also a considerable amount 

 of variety in the granulation of the costae, but the septal characters are closely similar 

 in all the specimens. 



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