TRIBE I. ASTR^EACEA. 243 



regularity the nearly vertical sides of the cells. The corona consists 

 of about ten prominent though small teeth. The process of subdivi- 

 sion in the cells is finely shown in this coral ; the dividing partition 

 cuts straight through the centre of the cell, without a converging or 

 rounding of the sides, as in species which are not polygonal. The 

 texture in a vertical section, is coarsely cellular below the stars, the 

 cellules being more than half a line long, and it is owing to this that 

 in a transverse section the cellules of the stars are deep ; the septum is 

 quite solid. The species resembles the last, but is smaller in its cells, 

 thinner and neater in its ridges, and more completely solid in its 

 septa. 



47. ASTRJEA SINUOSA. (Dana.) 



A. convexa. Corallum subcellulosum, cellis subangulatis, vix 2'" latis, 

 scepe flexuosis et longis (6'"), profundis, intus confertim coronatis ; 

 cottibus 1-1 '" crassis, rotundatis, abruptis, integris : lamellis cequa- 

 libus, subintegris: transverse secto, stellis vix multiradiatis, cum celr 

 lulis simplicibus ; septis %'" latis, fere solidis. 



Convex. Corallum subcellular ; cells subangular, hardly 2 lines 

 broad, sometimes lobed and flexiious and 6 lines long, rather deep, 

 crowdedly coronate within, ridges rounded, 1 to 1 lines thick, 

 abrupt, entire ; lamellae even, subentire : in a transverse section, 

 stars scarcely rnany-rayed, with the cellules simple ; septa J a line 

 thick and nearly solid. 



Plate 13, fig. 5, cells of corallum, natural size ; 5 a, section of cells 

 and ridges, showing profile of lamellae, natural size ; 5 b, transverse 

 section of corallum ; 5 c, vertical section of same. 



Feejee Islands. Exp. Exp. 



This species has thicker septa than the favistella, more rounded 

 ridges, more irregular cells, and a closer texture within. The cells 

 are usually quite narrow, and appear half closed below by the crowded 

 corona. 



