258 Mr. S. O. Ridley on the Coral-fauna of Ceylon. 



Family Poritidae. 

 Pontes echiniilata, Klunzinger. 



Porites echinulata, Klunzinger, Ivor. Roth. Meer. ii. i. p. 43, 



Also from Red Sea (Klunzinger). 



Porites punctata , Linn£. 



* 



Madrepora punctata, Linng, Syst. Nat. (12) p. 1277. 



Porites Gatmardtj Milne-Edwards & Haime. 



Porites Gaimardi, Milne-Edwards & Haime, Ann. Sci. Nat. (3) xvi. 

 p. 28. 



Also from Fiji Islands, New Ireland, Australia (Milne- 



Edwards & Haime). 



Pavonia percarinata, n. sp. 



Growth partially incrusting. From an extensive base arise 

 numerous subcylindrical lobes ; lobes, when young, 4-5, 

 when old 10-12 millim. in diameter at base, which is almost 

 cylindrical, and on which the carinse are very slightly marked, 

 becoming irregular in outline towards apex, chiefly owing to 

 the great development in number and size of the carinas, 

 which attain here a height of 1-2 millim. and are very sharp ; 

 they are chiefly longitudinal in direction ; ends of lobes more 

 or less rounded off, occasionally showing signs of division into 

 secondary lobes ; greatest height 30 millim. Surface of base 

 more even than that of lobes, owing to the inferior frequency and 

 prominence of the carinas. Calices small, 1*5-20 millim. in 

 extreme diameter, depressed ; columella a single pointed 

 papilla, often absent or obscure. Septa in three cycles, pri- 

 maries and secondaries subequal, with strongly convex edge, 

 thin j marginal teeth short, few; denticulations of surface 

 numerous, prominent, sharp ; tertiaries sloping obliquely 

 downwards, scarcely half so wide at base as the secondaries ; 

 septa sloping more or less downwards from between calices. 

 Corallum dense and massive. 



Hob. Galle, Ceylon (Dr. Ondaatje). 



The species which most closely resembles this externally is P. 

 prtsmatica, Briiggemann (Journ. Mus. Godeffroy, xiv. p. 207), 

 from Bonham Island (Marshall Islands) ; its lobes have not, 

 however, the triangular form of those of that species ; the 

 calices seem to be much smaller, and are neither arranged in 



distinct transverse rows nor quite horizontal between the 

 calices. P. repens, Bruggemann, is also nearly allied, but 









i 



