TRIBE III. MADREPORACEA. 469 



tumidulo, vix exserto; lateralibus confer tissimis, breviter labellatis 

 cequalibus et divaricatis, fere J'" latis; stella subconspicud, duabus 

 lamellis prominulioribus. 



Arborescent, spreading ramose, proliferous at apex; branches neatly 

 terete, an inch thick, very obtuse. Corallum having the apical 

 calicle very broad (1? to 2 lines), a little tumid, but scarcely exsert; 

 the lateral very closely crowded, short labellate, equal and erect, 

 nearly I of a line broad ; stars rather distinct, two of the lamellae 

 most prominent. 



Plate 35, fig. 5, corallum, natural size. 



Feejee Islands. Exp. Exp. 



This species is remarkable for its very short and closely crowded 

 calicles, each standing erect upon the sides of the branch, and all 

 forming, together, an even surface. The obtuse apices and very large 

 apical calicle, as well as the size of the branches, are other character- 

 istics. 



In one specimen, the stem is a little curved, and it is possible that 

 it may be part of a horizontally growing species, in which case it 

 should rank near the prostrata. 



40. MADREPORA EXIGUA. (Dana.) 



M. arborescens, late ramosa, gracilis, ramis teretibus, vix 3'" crassis, 

 acuminatis, curvatis. Corallum caliculis lateralibus brevissimis, orbi- 

 culato-nariformibus, vix "' latis, paulo confertis, celld orbiculata, sex- 

 radiatd, totidem duabus lamellis prominulioribus. 



Arborescent, spreading ramose, slender, branches terete, scarcely 3 

 lines thick, curved and acuminate. Corallum having the lateral 

 calicles very short, round-nariform, hardly f of a line broad, a little 

 crowded, cell round, six-rayed, sometimes two of the lamellse a 

 little prominent. 



Plate 38, fig. 2, corallum, natural size; 2 a, extremity of a branch, 

 ditto ; 2 b, profile of calicles. 



Feejee Islands. Exp. Exp. 



118 



