TRIBE III. MADREPORACEA. 45? 



tortuously entangled, often coalescing, slenderly attenuate ; stems 

 of an inch thick, branchlets } of an inch. Corallum scabrous and 

 striated with linear pores; apical calicle cylindrical, 4 of a line in 

 diameter; the lateral obsolete below two inches from the summit, 

 above this, short, round, nariform, and fragile, scattered ; star obso- 

 lescent. 



Plate 37, fig. 2, part .of corallum, natural size ; 2 a, part of section 

 of branch, enlarged. 



Feejee Islands. Exp. Exp. 



This species forms crowded clumps six or eight inches high, con- 

 sisting of slender tortuous branches and branchlets, bare of calicles 

 except within one and a half to two inches of the summit. It resem- 

 bles the tortuosa, but is more slender, more coalescent, and differs 

 in the character of the surface and the calicles. The linear pores give 

 rise to a wavingly striated surface. 



37. MADREPORA TORTUOSA. (Dana.) 



M. cespitoso-arborescens, stride ramosa, ramis confertis, sape coalitis, 

 paulo tortuosis, inferne, J" crassis, ramulis sape 2" longis et 2-4'" 

 crassis, acuminatis et subacutis. Corallum scabriculum, non stria- 

 turn; caliculo apicali |'" longo et lato ; lateralibus infra obsoletis, 

 supra breviter orUculato-nariformibus, fragilibus, stelld obsokscente, 

 duabus lameUis paululo prominulioribus. 



Cespitoso-arborescent, close-ramose, branches crowded, often coalesc- 

 ing, a little tortuous, below, an inch thick, branchlets often 2 

 inches long, and 2 to 4 lines thick, acuminate and subacute. Co- 

 rallum having the surface scabrous, but not at all striate; apical 

 calicle f of a line long and broad ; the lateral below 3 inches obso- 

 lete ; above, short round-nariform, fragile ; star obsolescent, two of 

 the lamellae but slightly prominent. 



Plate 37, fig. 3, part of corallum, natural size. 



Feejee Islands. Exp. Exp. 



The clumps of this species resemble those of the implicata, and are 



