]\Iadrepora in the British Museum. 459 



appressed tubular, with a ligulate border ; length 3 to 4 

 niillim,, diameter 2'5 niillim. across the lip, rather less at the 

 base. Star moderate. 



Thursday Island and Great Barrier Reef {Saville-Kent) . 



Madrepora latistella, 



Corallum subhorizontal, without fusions, recalling the 

 habit of M. jKitula. Branchlets on the upper surface erect, 

 spiciform, simple or in groups; length 2-5 to 3 centim., 

 diameter 5 millim. Apical corallites 2*5 to 3 millim. dia- 

 meter, cylindrical. Lateral corallites chiefly gutter-shaped 

 or labellate, ascending, becoming reduced to a crescentic rim 

 near the base of the twigs ; length 1*5 to 2 millim., diameter 

 1'3 millim. Star very well developed. 



Port Denison {Saville-Kent). 



Madrepora loripes. 



Corallum bushy, with numerous short, stout, arched 

 branchlets, usually without corallites on the inner side. 

 Apical corallites 4 millim. diameter, margin rounded. 

 Lateral corallites on the stouter divisions appressed tubo- 

 nariform to spreading tubular and proliferous, becoming- 

 verruciform below : those near the apex are appressed, 

 4 millim. long and 1*5 to 2 millim. thick; others become 

 tliicker, more spreading, 5 millim. long and 3 millim. dia- 

 meter, with shorter between; the stouter spreading ones 

 gradually give rise to arcuate branchlets naked on the imier 

 side. Star indistinct. 



Great Barrier Reef {Saville-Kent). 



Madrepora nigra. 



Madrepora Ehrenbergi, B.-Sniith (non M.-Ed. & II.), Ann. Mao- N 11 

 vol. vi. 1890, p. 452. 



Corallum prostrate, openly reticulate, under surftice sub- 

 complanate. Upper surface provided with erect or ascending 

 branchlets arranged irregularly, not over 7 centim. long, and 

 about 1"2 centim. thick near the base, tapering to a slender 

 apex. Apical corallites cylindrical, 2 millim. diameter, 1 to 

 2 millim. exsert. Lateral corallites on the branchlets 

 tubular, with oblique or gutter-shaped apex, slightly com- 

 pressed, length 2 to 4 millim., diameter 1*5 to 2 millim., 

 margin always sharply defined ; a few subimmersed ones are 

 scattered between. On the main divisions the corallites are 

 of the same type, but not compressed, and the aperture is not 

 so oblique, about 2 niilliui. long and broad. Star very pro- 



