TRIBE III. MADREPORACEA. 481 



55. MADREFORA NOBILIS. (Dana.) 



M. fruticose, arborescens, maxima, late et valde ramosa, subprolifera, 

 ramis crassis (scepe 1"), divaricatis, teretibus, ramulis extremis -1" 

 crassis, apice conicis. Corattum scabriculum, caliculo apicali crasso 

 (1J'" lato), vix exserto ; lateralibus confer tissimis, divaricatis, validi- 

 usculis, s<zpius,l%'" longis, dimidiatis, non compressis, striatis, margine 

 vix crasso, raro proliferis, aliis obsolescentibus ; stelld sex-radiatd, valde 

 conspicud, duabus lamettis prominulioribus. 



Shrubby arborescent, very large, spreading ramose, subproliferous ; 

 branches stout (often 1 inch thick), divaricate, terete, summit branch- 

 lets to 1 inch in diameter, conical at apex. Corallum scabrous; 

 apical calicles large (H lines broad), scarcely exsert; the lateral 

 much crowded, nearly erect, hardly stout, mostly 1^ lines long, 

 (with others obsolescent), dimidiate, not compressed, margin scarcely 

 thick, striate, rarely proliferous; star six-rayed and very distinct, 

 two of the lamellae the most prominent. 



Plate 40, fig. 3, branch of corallum, natural size; 3 a, extremity of 

 branch. 



East Indies. Singapore. Exp. Exp. 



This species forms spreading clumps, similar to those of the proli- 

 fera ; but the branches are much stouter, more abruptly pointed, 

 and less proliferous, and the calicles are very different. 



56. MADREPORA SECUNDA. (Dana.) 



M. arborescens, late ramosa, ramis numerosis, teretibus, -" crassis, 

 ramulis extremis J" crassis, sensim attenuatis. Corallum scabri- 

 culum, caliculo apicali lineam fere lato; later alibus subconfertis, 

 cequalibus, nariformibus et dimidiatis, valde compressis, validiusculis, 

 1-1 '" longis, margine non incrassato, ramorum latere inferiore obso- 

 lescentibus ; aperturd oblongd, stelld conspicud, duabus lamellis valde 

 prominulis. 



Arborescent, spreading, ramose ; branches numerous, terete, ^ to of 



121 



