TRIBE III. MADREPORACEA. 449 



somewhat larger; star obsolete, two lamellae quite broad; apical 

 calicle very exsert (1 line), nearly or quite | of a line broad. 



Plate 33, fig. 3, part of corallum, natural size ; 3 <z, branchlet, natural 

 size. 



The East Indies. Exp. Exp. 



The specimen in th'e collections, is a large frond, measuring sixteen 

 inches by twelve in breadth, with a short pedicel on one side, by 

 which it was laterally attached. It is a neat species with long aci- 

 cular, and nearly naked branchlets, evenly terete, and not proliferous 

 above. It has something of the habit of a Seriatopora in the appear- 

 ance of its branchlets. The cell is very small, and two large lamellae 

 bisect it deep within. 



14. MADREPORA CONVEXA. (Dana.} 



M. late cespitosa, breviter pedicellata, superne convexa, ramis fere hori- 

 zontalibus reticulalo-coalitis ; infra complanatis cum paucis ramulis 

 nudis subangulatis ; supra ramulis medianis teretibus, raro angulatis, 

 subsimplicibus, totidemproliferis, 2-2i" longis et J" crassis, margina- 

 libus ruditer acervato-proliferis. Corallum caliculo apicali curto, 

 cylindrico, ?'" lato ; aliis labellatis, fragilibus, labello lato et elongate, 

 valde complanato, stelld conspicud, 6-radiata, duabus lameUis latioribus. 



Broad cespitose and short pedicellate, convex above, branches nearly 

 horizontal, reticulato-coalescent; below flattened with a few naked 

 subangular branchlets ; above branchlets of the central portions 

 terete, rarely angular, nearly simple, sometimes proliferous, 2 to 2 

 inches long, and \ of an inch thick; the marginal branchlets rudely 

 acervato-proliferous. Corallum with the apical calicle short, cylin- 

 drical, * of a line broad ; other calicles labellate, fragile, lip broad 

 and elongated, much flattened ; star distinct, 6-rayed, two lamellae 

 broader than the others. 



Singapore, East Indies. Exp. Exp. 



This species forms low circular clumps, convex above, ten inches 

 or more in diameter, supported on a stout pedicel. The corallum is 



113 



