454 Mr. G. Brook on new Species of 



Madrepora hotryodes. 



Madrepora ffonaffra, Briiggemann, Abhand. nat. Ver. Bremen, 1877, 



p. 398. 

 Madrepora Hairnet, Briiggemann, loc. cit, p. 575 (part.). 



Corallum subcespitose, sometimes incrusting a dead colony ; 

 new growth about 3*5 centim. high. Branches erect and 

 crowded, 1*2 to 1'5 centim. diameter, but broader at the 

 apex, which is occupied by numerous crowded proHferous 

 corallites, which form an acervate apex ; in old specimens 

 the apices become fused together. Apical and proliferous 

 corallites 3'5 to 5 millim. diameter, cylindrical, but with 

 crowded margin and small aperture. Lateral corallites 

 appressed, tubular or half-tubular, very variable in size, wall 

 often dilated ; the more prominent ones are 2 to 3 millim. 

 diameter, with rounded margin, many others verruciform. 

 Star very well developed. 



Rodriguez. 



Mad^'epora hvevicollis. 



Corallum cespito-arborescent ; branches 8 to 12 centim. 

 long and 1*5 centim. thick in bushy specimens, but may be 

 22 centim. or more in those which extend obliquely ] the 

 former are much divided, and bear numerous spreading twigs 

 and short proliferations. Apical coraUites 3 to 4 millim. 

 diameter, shortly cylindrical, margin often a little rounded. 

 Lateral corallites much crowded, chiefly half-tubular and 

 labellate, sometimes distinctly compressed ; diameter 1"5 

 millim., more rarely 2 millim., outer part of the wall distinctly 

 thickened in the stouter corallites. Star distinct. A variety 

 with more or less tubular corallites occurs amongst the 

 Rodriguez specimens, and was referred by Briiggemann to 

 M. jjustulosa, Ed. & H. The same variety also occurs in 

 Mr. Saville-Kent's collection from the Great Barrier Reef. 



Rodriguez ; Great Barrier Reef, Torres Straits {Saville- 

 Kent) . 



Madrepora hullata. 



Corallum cespitose from an incrusting base; branches 

 simple or forked, 5 to 6 centim. long and 1*7 centim. diameter 

 at the base, gradually tapering to a blunt apex, covered with 

 scattered and spreading proliferous corallites. Apical coral- 

 lites 5 to 6 centim. diameter, margin strongly curved except 

 in young condition. Lateral corallites tubular, with some- 

 what oblique apex, rarely nariform, increasing in length 

 from the apex downwards for a distance of 3 centim., below 



