460 Mr. (jr. Brook on new Species of 



minentj and the septa are level with the margin for their 

 whole length. 



Tizard Bank, 5 fathoms {H.M.S. 'Rambler'), 



Madrepora oUgocyatlms. 



Corallum fan-shaped, semi-vasiform, pedicellate, closely 

 resembling M. microcladosj Ehrb., in habit. Apical coral- 

 lites 2 millim. diameter, wall very thin. Lateral corallites 

 immersed or subimmersed) excepting near the apex of the 

 branchlets, where a few are short, round, nariform ; the 

 marginal branchlets usually bear more or less prominent 

 corallites to the base, 1 millim. diameter, the outer part of the 

 wall rarely over 1*5 millim. long. Star indistinct. Corallum 

 very fragile. 



Mauritius {Rohillard) . 



Madrepora orhicularis, 



Corallum disk-shaped, composed of several layers of radi- 

 ating branches fused into a solid mass excepting near the 

 periphery. Apical corallites 2"5 to 4 millim. diameter, cylin- 

 drical. Lateral corallites dimidiate and somewhat appressed 

 near the apex of a branch, but spreading at right angles, 2'5 

 to 6 millim. long and 1*5 to 2 millim. thick ; the larger ones 

 are proliferous, but the buds are always small and delicate 

 labellate; small labellate and immersed corallites extend 

 between the more prominent ones. 



Ceylon {Dr. Ondaatje). 



Madrepora patula. 



Corallum broad, depressed, bushy, from a short simple 

 stem, diameter nearly three times the height. Branchlets on 

 the upper surface spiciform, simple or in subparallel divisions, 

 2 to 4*5 centim. long, 7 millim. thick if simple, gradually 

 tapering. Apical corallites 2 millim. diameter, cylindrical. 

 Lateral corallites chiefly nariform, outer borders at an angle 

 of 45°, more or less prominent quite to the base of the 

 branchlets, length 2 millim., rarely 8 millim. with an elongate 

 lip, diameter 1*2 to 1*5 millim, wall thin and fragile. Star 

 indistinct. Branchlets on under surface 8 to 16 millim. long, 

 4 millim. diameter, tapering, with nariform, or more frequently 

 verruciform, corallites. 



Port Denison [Saville-Kent). 



Madrepora pecttnata. 

 Corallum plate-like or vasiform, recalling the habit of 



