472 ZOOPHYTES. 



thin-lipped, or obsolescent, calicles. The terminal branches are often 

 six inches long, and are very gradually tapering. The specimen in 

 the collections is fifteen inches high, and the lower eight inches are 

 without a branch. 



44. MADREPORA HORRIDA. (Dana.) 



M. arborescens, maxima, divaricate remoteque ramosa, ramis infra 1-2" 

 crassis, fere teretibus, curvatis, sensim attenuatis, undique valde pro- 

 lifer is, ramiculis divaricatis, l-2" longis. Corallum Jiorride calicu- 

 latum, scabriculum ; caliculo apicali tubiformi, non incrassato ; late- 

 ralibus tenui-tubiformibus, divaricatis, totidem reflexis, valde incequa- 

 libus, aliis J" longis, aliis sparsis obsolescentibus, aliis proliferis, extus 

 striatis ; stelld sex-radiatd. 



Arborescent, very large, divaricately and remotely branched, branches 

 below 1 to 2 inches thick, nearly terete, curved, gradually attenu- 

 ate, throughout very proliferous, with divaricate ramiculi 1 to 2 

 inches long. Corallum bristled with calicles and scabrous; apical 

 calicle tubiform, not incrassate; the lateral, thin-tubiform, divari- 

 cate, and sometimes reversed ; very unequal, some J of an inch 

 long, others interspersed obsolescent, others proliferous ; star six- 

 rayed. 



Plate 39, fig. 2, corallum, natural size ; 2 a, extremity of branch, 

 natural size. 



Feejee Islands. Exp. Exp. 



This species is remarkable for its size, and its few large and long 

 branches, bristled with unequal tubiform calicles and short branchlets, 

 which stand out on all sides nearly at right angles with the surface. 

 The specimen in the collections is a branch sixteen inches high, 

 bearing three or four lateral branches, and is but a part of the whole 

 zoophyte; it is nearly two inches thick at base, and gradually dimi- 

 nishes upward. 



