518 ZOOPHYTES. 



guish it from the mordax. The intervals between the branches are 

 one-half to two-thirds of an inch, rarely an inch. 



Sideropora palmata, Blainville, Man., 384, 385 ; the description by Blainville is im- 

 perfect, and the specimens are referred to his species with some hesitation. 



5. SIDEROPORA MORDAX. (Dana.} 



S. ramis subsimplicibus, valde compressis, superne, non rarioribus, 

 vix flabellatis, -1" latis, et J" crassis ; polypis disco lutescentibus, 

 tentaculis brevibus, late virentibus, basi brunneis. Corallum cellis 

 valde fornicatis, itaque super jicie bene scabrosa. 



Branches nearly simple, much compressed, not thinner at apex, 

 scarcely flabellate, to 1 inch broad, and J of an inch thick ; polyps 

 with a pale yellowish disk, and short tentacles of a bright green 

 colour, deep brown at base. Corallum with the cells strongly 

 vaulted, and the surface, therefore, decidedly scabrous. 



Plate 49, fig. 1, zoophyte, natural size; 1 a, polyp, enlarged; 1 b, 

 cells of surface, at summit, enlarged. 



Feejee Islands. Exp. Exp. 



This species resembles ihepalmata, but is smaller, with the branches 

 not thinner above, and separated by intervals of but a third of an inch ; 

 the surface, moreover, is quite strongly scabrous. The clump in the 

 collections is about four and a half inches across and three high. 



GENUS III. SERIATOPORA. LAMARCK. 



Favositidce tenuiter ramosce ; ramis ramulisque teretibus, polypis verti- 

 caliter plus minusve seriatis. Corallum cellis obsolete radiatis, non 

 profundis et infra solidescentibus. 



Slenderly ramose ; branches and branchlets terete, polyps vertically 

 more or less seriate, cells of corallum obsolescently rayed, not deep, 

 and becoming filled and solid internally. 



