Madrepora in the British Museum. 455 



which a few are more elongate, but the majority short. Star 

 very prominent. Differs from M. canaliculata, Klz., in the 

 complete absence of dimidiate corallites and in the much 

 better developed star. 



Port Denison {Saville'Kent) . 



Madrepora calamaria. 



Madrepora plantaginea, Brliggemann (non Lamarck), Phil. Trans, vol. 



clxviii. p. 575. 

 Madrepora acermta, Briiggemann (non Dana), ibid. p. 675. 



Corallum cespitose from a short pedicellate base ; marginal 

 branches short and horizontal ; middle branches 7 centim. 

 long and 15 centim. thick, crowded and angular, more or less 

 divided ; divisions digitiform, little spreading. Apical coral- 

 lites somewhat conical, 3"5 to 5 millim. diameter at the base. 

 Lateral corallites very unequal in size, many appressed and 

 dilated, more or less completely tubiform; length 3 to 5 

 millim., diameter 2 to 2'7 millim., but with small or sub- 

 immersed ones between. Star indistinct. 



Kodriguez. 



Madrepora clavigera. 



Corallum forming horizontal fronds 3 centim. thick, the 

 main divisions reticulately coalescent ; branches sinuous, 

 flattened below, 1 centim. broad. Corallites on the under 

 surface chiefly marginal, stout, spreading, tubular with rounded 

 apex, some are 8 millim. long and bear buds. Upper surface 

 of main divisions with numerous hemicotyloid and appressed 

 tubular corallites. Branchlets on the upper surface erect, 

 2 centim. long, and rarely over 4 millim. diameter at the base 

 if simple ; each consists typically of an elongate club-shaped 

 apical corallite, which bears buds which near the base are 

 hemicotyloid and irregular, but tubular above, where from 

 one to four radiating corallites surround the apical one. 

 Apical corallites 7 to 12 millim. long, with a maximum dia- 

 meter of 4 to 4"5 millim. 



The type specimens were presented by Captain Belcher, 

 R.N., but the habitat is not recorded. 



Madrepora cophodactyla. 



Corallum broad, flattened, cespitose, with a very broad base. 

 Branches short, stout, and very obtuse at the apex, simple or 

 divided near the middle ; length 3 to 5 centim., diameter 1'7 

 to 2 centim. at the base and over 1 centim. at the apex. 

 Apical corallites 3 to 3*75 millim., scarcely prominent. 

 Lateral corallites stout, dilated, appressed tubular, with the 



