TRIBE III. MADREPORACEA. 531 



The rude-looking clumps are a foot or more in diameter, and con- 

 sist of stout uneven branches, not rising quite to the same height. 

 The verruca? are irregular and large, and extend over the summits, 

 excepting sometimes a small area at the very apex. The species is 

 much coarser and stouter than the verrucosa, and is peculiar also in 

 the one broad lamella of the cell. It resembles somewhat the elongata, 

 but its clumps are far more closely crowded, the branchings shorter, 

 and the cells but obsoletely stellate. 



10. POCILLOPORA ELONGATA. (Dana.} 



P. hemispherica, ramis remotis,fere rectis, valde ekngatis, teretiusculis 

 %" crassis, apice dilatatis (" crassis et scepe 2" latis) undique inferne 

 superneque scepe ad extremum apicem verrucosis, verrucis cequalibus, 

 obtuse conicis. Corallum cellis parvulis ('" latis}, stelld profundd 

 bene conspicud, interdum columella minutd. 



Hemispherical, branches widely separate, nearly straight, and very 

 long, subterete, f of an inch thick, dilated at apex ( an inch thick 

 and often 2 inches broad), every where below and above even to 

 the very apex verrucose, verrucae even, obtusely conical. Corallum 

 having the cells small ( of a line broad), star neat and quite dis- 

 tinct, and situated rather deep within the cell ; a minute columella 

 sometimes seen. 



Plate 50, fig. 4, branch in outline, natural size; 4 b, cells, enlarged. 



Ceylon, Indian Ocean. Rev. G. A. Apthorp. 



This species is remarkable for its long stout stems, in general but 

 little compressed, and separated in the clump by intervals of an inch. 

 Some of the simple undivided branches are six inches long ; and the 

 whole surface far from the summit, is quite evenly verrucose. The 

 star of the cell is very neat and regular. 



11. POCILLOPORA LIGULATA. (Dana.) 



P. hemispherica, ramis subdivisis, paulo remotis, rectis, tenuibus (2-3'"), 

 valde compressis et complanatis, J-14" latis, verrucis parvulis ascen- 



