TRIBE II I. MADREPORACEA. 521 



3. SERIATOPORA HYSTRIX. (Dana.) 



S. ramis validis, infra 3'" crassis et scepe coalitis, ramulis elongatis, 

 acute conico-subulatis, 2'" crassis; polypis 8-lQ-seriatis, tentaculis 

 roseis. Corallum ramulis apice non alatis ; cellis fornicatis, J'" latis; 

 infra cellis interdum sparsis. 



Branches stout, below, 3 lines thick, often coalescing ; branchlets coni- 

 cally subulate and acute, 2 lines thick; polyps in 8 to 10 series, 

 tentacles rose-red. Corallum with the branchlets riot winged at 

 summit; cells vaulted, of a line broad; below, cells sometimes 

 scattered. 



Plate 49, fig. 3, central part of a hemispherical clump, natural size; 

 3 a, from the outer part of the same ; 3 b, part of a transverse section, 

 enlarged. 



Feejee Islands. Exp. Exp. 



This species grows in regularly hemispherical clumps, ten or twelve 

 inches in diameter. It is remarkable for its stout and neatly terete 

 branches, tapering above to a point which is not winged, and covered 

 with cells in eight to ten or sometimes twelve series. Near the apex, 

 the cells are scarcely oblong or oblique. The lower branches of the 

 clump are divaricately branched ; but those above are more closely 

 crowded, the branches forking at a small angle. The branchlets of 

 this part are often three inches or more in length, while those below 

 of the divaricate kind, are but an inch or so long. The cells are short 

 stellate, with six lamellae. 



4. SERIATOPORA OCTOPTERA. (H. 4- Ehrenberg.) 



S. ramis validiusculis, (vix 2'" crassis); infra, scepe coalitis ; polypis 

 6-8-seriatis, virentibus. Corallum ramulis apice subobtusis, hexapteris 

 vel octopteris ; cellis vix fornicatis, oblongis. 



Branches rather slender (scarcely 2 lines thick), below, often coa- 

 lescing; polyps in 6 to 8 series, greenish. Corallum with the 



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