TRIBE III. MADREPORACEA. 479 



lets and proliferous polyps. Corallum scabrous; apical calicle stout 

 (1 to li lines broad), exsert; the lateral ascending, rather crowded, 

 tubiform and tubo-nariform, 1 to 2 lines long, rough and striate; 

 aperture circular, star distinct but deep, six-rayed, with two of the 

 rays most prominent. 



Grows in clumps six inches or more in height, consisting of several 

 arborescent stems from- the same base, all of which are very proli- 

 ferous. The apical calicle is very large and stout ; the upper lateral 

 are minute (less than half a line), and gradually increase downward, 

 and become tubiform with an oblique apex, the aperture opening 

 inward and upward. Others still larger are regularly tubiform and 

 proliferous, and commence to form branchlets. The species is near 

 the abrotanoides, but differs in its harsher surface and strongly striate 

 calicles; moreover, obsolescent calicles are rare. 



53. MADREPORA. CERVICORNIS. (Lamarck.) 



M. arborescens, maxima, late et remote ramosa, caule 1J-2" crassa, 

 ramulis prcelongis, -f " crassis, arcuatis, teretibus, sensim attenuatis. 

 Corallum scabriculum, caliculo apicali crasso (Ji'"), elongato ; late- 

 ralibus subcequalibus, or~biculato-nariformibm vix compressis, l-2'" 

 longis, fere 1'" crassis, valde striatis, margine non crasso, stelld con- 

 spicua. 



Arborescent, very large, spreading and remotely ramose, below, lito 

 2 inches thick, branchlets very long, to of an inch thick, arcuate, 

 terete, gradually attenuate. Corallum scabrous, apical calicle stout 

 (li lines), and elongate; the lateral subequal, round-nariform, 

 scarcely compressed, l to 2 lines long, and nearly a line in diame- 

 ter, strongly striate, margin not thick, star distinct. 



West Indies. 



This is a common species in the West Indies, where it grows six 

 feet or more in height, with wide-spreading arcuate branches, every 

 where covered with stout prominent calicles. It differs from thepro- 

 lifera in its larger size, more distant and arcuate branches, rarely pro- 

 liferous, and the distinctness of the entire striae of the calicles. 



