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Mr. S. 0. Ridley on the Coral-fauna of Ceylon. 259 



wants the very sharp superior carinas and the strong tendency 

 to form lobose projections. 



Pavonia explanulata, Lamarck. 



Agaricia explanulata, Lamarck, Hist. Anim. s. Vert. (2) ii. p. 383. 



Lamarck gives the species as probably from the Indian 

 Ocean. 



Pavonia , sp. 



A species strongly resembling P. repens, Briiggemann, but 



with the different cycles of septa quite distinct in size from 

 each other. 



Family JIadreporidae. 



Madrepora cytkerea, Dana. 



Madrepora eytherea, Dana, Zooph, U.S. Expl. Exp. p. 441, pi. xxxii. 

 fi#s. 3 a, 3 b. 



A large tabular specimen, rather elevated in the centre. 

 Anastomosis of the branches has gone so far as to leave very 

 few meshes between them ; and their ends are but imperfectly 

 distinct. Klunzinger records it from the Red Sea, Dana from 

 Tahiti^ Mobius from Mauritius. 



Madrepora flabellif or mis } Milne-Edwards & Haime. 



Madrepora jlabelUformis, M.-Edw. & H. Hist. Nat. dea Coralliaires, 

 iii. p. 156. 



'Recorded from the Indian Ocean by the above-named 

 authors. 



* Montipora foliosa y Milne-Edwards & Haime. 



Montipora foliosa, Verrill, Proc. Essex Institute, vi. p. 51. 



Recorded with doubt from Ceylon by Verrill. 



* Stephanoseris sulcata, Verrill. 



Stephanoseris sulcata, Verrill, Proc, Essex Institute, v. p. 48. 



Originally described from Ceylon by Verrill. 



Group Tabulate 

 Poctllopora grandis y Dana. 



PocUlopora grandh, Dana, Zooph. U.S. Expl. Expedition, p. 533, pi. Ii. 

 fig. 2. 



This species is also found at the island of Rodriguez 

 {Briiggemann) y and at the Fiji Islands and Tahiti (Dana). 



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