TRIBE II I. MADREPORACEA. 441 



B. Vasiformes, aut cespitosae. 

 I. Caliculis fragilibus, labellatis. 



6. MADREPORA EFFLORESCENS. (Dana.} 



M. vasiformis (?}, ramis in laminam solidam -|" crassam coalitis, 

 prope marginem, retrculatam et per ramos conjunctos costatam ; infra 

 plana ; supra ramulis crebris brevissimis, marginalibus %" longis, 

 et ^" crassis, medianis nunquam teretibus \" longis, acervatis et pro- 

 liferis. Corallum infra breviter caliculatis ; supra ramulorum cali- 

 culis labellatis, labello elongato et erecto, apicali cylindrico 1'" longo 

 et $'" lato. 



Vasiform (?), branches coalescing into a solid plate to f of an inch 

 thick, which is reticulate only near the margin, and ribbed with the 

 coalescing branches; below flat; above, having very short crowded 

 branchlets, the marginal an inch long and ^ of an inch in diame- 

 ter, but those of the middle of the frond not terete, a fourth of an 

 inch long, acervate and proliferous. Corallum below with short 

 calicles; above, the calicles of the branchlets labellate, lip long and 

 erect, the apical calicle cylindrical, a line long and J a line broad. 



Plate 33, fig. 6, fragment of corallum, natural size. 



Ceylon, East Indies. Rev. G. A. Aphthorp. 



This species approaches the cytherea in the proliferous clusters of 

 calicles about the middle of the frond in place of proper branchlets, 

 but differs essentially in the branchlets being coalesced into a solid 

 plate; and, moreover, the branchlets near the margin are much 

 shorter and more slender. The largest specimen examined was a 

 fragment six inches in breadth ; in its stoutest part it was three-fourths 

 of an inch in thickness. The solid frond resembles the flabellum ; 

 but that species is without branchlets above, and has tubular calicles. 



7. MADREPORA CYTHEREA. (Dana.) 



M. vasiformis, pedicellata, fronde latissimu, 1-2" crassa, ramis reticu- 

 lato-coalitis ; infra complanalis, ramulis nullis ; supra, ramulis con- 

 Ill 



