570 ZOOPHYTES. 



Erect, 1 to 2 feet high, compressed cylindrical, and subclavate, 2 to 4 

 inches thick; summits rounded, furcately subdividing above; alive 

 for 2 to 3 inches ; polyps cylindrical, 2 to 3 lines salient, of a pale 

 lilac tint, tentacles 18 to 24 in number. Corallum very porous ; 

 cells angular, excavate, 1 lines broad ; margin acute, granulate ; 

 cells below obsolete. 



Plate 56, fig. 5, zoophyte, natural size ; 5 a, polyp, enlarged ; 5 b, 

 part of summit, showing the cells, natural size. 



Feejee Islands. Exp. Exp. 



This species is near the preceding, yet the form of the polyps, judg- 

 ing from Quoy and Gaymard's .figures, is quite different, the cells 

 larger, and the mode of growth is peculiar. The large columns grow 

 to a height of two feet or more, but only the tips for two or three 

 inches are alive; the part below is incrusted with Nullipores, sponges, 

 and various shells. The lower cells, or those towards the limits of 

 the live portion, are quite superficial. No distinct lamella are seen in 

 any of them. 



NOTE. G. Savignii. Savigny's figure 2, tab. 5, (Desc. do 1'Egypte,) has much of 

 the appearance of a Goniopora, and some resemblance to the preceding, though smaller. 

 It represents a single stout stem, with several ascending clavate lobes, somewhat com- 

 pressed, and two to four inches broad, with a subtruncate top. The whole clump is 

 seven inches high, and has nearly the shape of an inverted cone. The cells are nearly 

 circular, contiguous, or planulate, and about one-eighth of an inch broad. The summits 

 are alive for about two inches. 



Ehrenberg refers to this figure, with a query, under his Astrcea planulatu. 



TRIBE M A DREPORACEA: APPENDIX. 



The animals of the following genera are unknown ; and the species 

 are so imperfectly understood, that their connexion with the tribe Ma- 

 dreporacea is uncertain. 



ERRINA. GRAY. 



Ramosce ; ramis muricatis, caliculis prominulis et inferne longitudina- 

 liter jissis ; Milleporce habitu affines. 



