48 PERCY SLADEN TRUST EXPEDITION 



body-wall it is extremely tliin, while in the secondary mesenteries it is a uniformly thin 

 layer on either side of the mesoglsea. 



Polyps examined, seven, three from a well-preserved specimen from Suvadiva, four 

 from a badly-preserved specimen from Saya de Malha. 



B. Corallum. A specimen from Ceylon in the Berlin Museum, measuring 8x8 cm., 

 which Ortmann had referred to Cyphastrcea muelleri, resembles the present species in the 

 highly vesicular condition of its peritheca and in the thinness of its septa, but the septal 

 teeth are not quite so long as in Cyphastrcea maldiveibsis, Gard., and the corallites 

 are slightly projecting. 



Localities. Maldives: Felidu 20 — 25 fms. (l); S. Nilandu 25 fms. (l); Suvadiva 

 (small fragments). Saya de Malha 26 — 29 fms. (3). Amirante 725 fms. (l). Cargados 

 30 fms. (l). Also from Ceylon (Ortmann). 



5. Cyphastrea gardineri, n. sp. (PL 13, figs. 4 and 5; 34, fig. 5.) 



1899. Cyphastrcea chalcidicum, Gardiner, Proc. Zool. Soc. London, p. 761 (non Cyphastrcea chalcidicum, 



Klunzinger). 

 1904. Cyphastrcea hemprichana, Gardiner, Fauna Geogr. Maldives and Laccadives, ii, p. 779 (non Solenastrcea 



heviprichana, Milne Edwards and Haime). 



Corallum. With either even surface or raised into low humps. Peritheca dense, 

 dissepiments much thickened as in C microphthalma, with conspicuous, blunt, somewhat 

 smooth spines, thicker and higher than in any other previous species, and irregularly 

 distributed. Corallites from almost touching to 2 mm. apart, projecting up to "75 mm. 

 Calicos about 1'5 mm. in diameter, deep. 



Septa exsert, sides rough, inner margins perpendicular with short blunt teeth, 

 decreasing in width and thickness from primaries to tertiaries ; only primaries meeting 

 columella, but narrower than in other species. Costse distinct on projecting corallite- 

 walls. Columella deep down in calyx, often invisible from above. 



No Polyps. 



This species differs from both Solenastrcea hemprichana, Ed. and H., and Cyphastrcea 

 chalcidicum, Klunz., in the following respects : (1) dense peritheca, (2) perithecal spines 

 numerous and prominent (in these characters approaching C microphthcdma, but the 

 spines are usually blunt and somewhat smooth), (3) calices somewhat deeper, hence 

 columella often invisible from above, (4) septa thicker and rougher (in this respect 

 resembling C. serailia). In the cylinder-like appearance of the corallites the species 

 agrees with C. chalcidicum. Its true position in the genus can, however, be determined 

 only after an examination of its polyps. 



Localities. Bed Sea (1). Botuma (l). Maldives, Hulule (l). 



EcHiNOPORA, Lamarck. 



1816. Echinopora, Lamarck, His. anim. sans, vert., ii, p. 252. 



1816. Explanaria (pars), Lamarck, His. anim. sans, vert., ii, p. 254. 



1830. Eohinastrea, Blainville, Diet. Sci. Nat., Ix, p. 327. 



1830. Tridacophyllia (pars), Blainville, Diet. Sci. Nat., l.x, p. 343. 



1834. Stephanocora, Elirenberg, Corall. roth. Meer., p. 76. 



1834. Explanaria (pars), Ehrenberg, Corall. roth. Meer., p. 82. 



