MADEEPORA. 153 



oblique. Star well developed, but deep. Corallum very dense ; surface reticulate and 

 echinulate ; wall striato-reticulate. 



Pacific Ocean : Tahiti. 



? a. ? Purchased. 49. 5. 18. 2. 



161. Madrepora platycyathus. 



Madrejiora plantaginea, Ortmann {non Lamarck), Zool. JB. 1888, Bd. ill. p. 151 (part.). 

 ? Madrepora cf. globiceps, Ortmann, Zool. JB. 1888, Bd. iii. p. 1 51 (part.). 



Corallum cespitose, branches 8 to 9 cm. long and 1*6 cm. thick, subdivided above, the 

 apices about 1*5 cm. apart. Axial corallites 3 mm. diameter, slightly exsert and a little 

 tapering. Radial corallites ascending, compressed, tubular, but the inner part of the wall is 

 only fully developed in the longer corallites ; aperture more or less oval : those which are 

 quite tubular average 5 mm. in length and 2 mm. in diameter ; wall thickened and dense, 

 margin distinctly rounded : many are 6 mm. long, distinctly compressed (3 by 2 mm.), and 

 bear two or three small buds near the base; others between are appressed, nariform or 

 labellate, rarely subimmersed. Corallum stony, but still more or less reticulate in section j 

 surface strongly echinulate, wall finely so. 



A specimen from the Indian Ocean [Conrad), referred doubtfully by Ortmann to 

 M. globiceps, probably belongs here, but differs in minor points from the type specimen. 

 The axial corallites are more prominent and may be 2 mm. exsert. The radial corallites are 

 not so large and irregular as in the type specimen, and fewer are proliferous ; but all are of 

 the same form, 3 to 4 mm. long, with short or subimmersed ones between. 



Indo-Pacific Ocean : Tahiti, Indian Ocean {Strassburg Museum). 



D. Wall of radial corallites dense and dilated at the base, but thin at the margin. 



162. Madrepora botryodes. (Plate XXXIV. fig. C.) 



Madrepora gonagra, Briiggemann {nan M.-Edwards & Haime), Abh. naturw. Ver. Bremen, 1877, Bd. v. 



p. 398 ; Briiggemann, Phil. Trans. 1879, vol. clxviii. p. 575, 

 Madrepora haimei, Briiggemann, loo. cit. p. 575 (part.). 

 Madrepora botryodes. Brook, Ann. Mag. N. H. 1892, vol. x. p. 454. 



The only specimen referred by Briiggemann to M. gonagra which has come under my 

 notice is the Rodriguez variety, which he compares to a cauliflower. This specimen does not 

 appear to me to agree with the short description of M. gonagra given by Milne-Edwards. 

 With regard to Briiggemann's Mauritius specimen and the type of M. gonagra I have to 

 judge of the appearance of both with only the descriptions to guide me. Milne-Edwards 

 uses the expression " calicles courts, arrondis et groupes irregulierement, de fa9on k simuler 

 des nodosites." Briiggemann, on the other hand, has the following : — " Charakteristisch fiir 



