Madrepora in the British Museum. 4:61 



North Australia {Elsey) , types ; Great Barrier Reef area 

 {Saville-Kent) . 



Madrepora exilis. 



Corallura very variable in form, shrubby arborescent to 

 virgate, with short peripheral twigs as in M. ornata. Apical 

 corallites scarcely 2 millim. diameter, cylindrical. Lateral 

 corallites nariform or tubo-nariform, a little spreading, be- 

 coming tubular and proliferous ; usually 2 millim. long and 

 1*5 millim. diameter; wall firm and a little thickened. 

 Numerous subimmersed corallites between the branchlets have 

 a ring-shaped border. Star distinct. 



Arafura Sea, 10 fathoms {E.M.8. 'Penguin^); Port 

 Denison [Saville-Kent) ; Macclesfield Bank, 13 fathoms 

 [H.M.S. 'Penguin'). 



Madrepora fruticosa. 



Corallum bushy, cespitose, hemispherical above ; middle 

 branches 9*5 centim, long and 2 centim. thick, angular below. 

 Apical corallites subhemispherical, 4 to 5 millim. diameter. 

 Lateral corallites rather regular and spreading, a little com- 

 pressed, chiefly tubiform, with the inner part of the wall 

 always thin and usually shorter, the outer thick ; length o'5 

 to 5 millim., diameter 2"2 to 2'5 millim., shorter and quoit- 

 shaped below ; margin plain ; star distinct. 



Habitat not recorded. 



Madrepora gemmifera. 

 Madrepora seriata, Qiielch (part.), Challenger Eeef Corals, p. 155. 



Corallum massive, corymbose. Central branches erect, 

 digitiform, 4 to 6 centim. long and V5 to 2*5 centim. thick, 

 quadrate and proliferous near the base ; marginal branches 

 divided, the outer divisions covered with numerous spreading 

 blunt twigs. Apical corallites hemispherical, 4 millim. dia- 

 meter. Lateral corallites broad, spreading, subtubular or 

 gutter-shaped, with small immersed cells between. Promi- 

 nent ones increase in length from the apex downwards, often 

 arranged in rows, the lower ones of a row being proliferous; 

 length 1*5 to 4 millim., diameter 2 to 3*5 millim. Star 

 indistinct. 



Great Barrier Reef (Saville-Kent) j Fiji {' Challenger'). 



Madrepora grandis. 



Corallum stout and lax arborescent, distal divisions rela- 

 tively slender and tapering. Apical corallites 3 millim. dia- 



