Mr. J. E. Gra/s Outline of an Arrangement of Stony Corals. 127 



nia, t. 96, the animal of Mad. carulea, but in the Voyage of the 

 Astrolabe they found that what they had taken for the animals 

 must be parasites, which must have been lodged between the cells, 

 and not what they then regarded as the true animals of the corals. 

 M. Lesueur figm'cs the animal of several species of Meandrince, 

 but they all differ from the animal which MM. Quoy and Gaimard 

 (Voy. Astrolabe) figure as being the animal of that genus, and 

 both differ from M. Ehrenberg^s account of the animal. Lesueur 

 describes Astrcea ananas as having no tentacles, and Quoy de- 

 scribed under the same name a coral that has small rounded 

 tubercle-like tentacles ! 



Synopsis op the Families. 



1. Animal 12- or fewer rayed, with 12 or fewer tentacles placed 

 in a single series ; coral cells gemmiferous, circumscribed, simple, 

 with 12 or fewer longitudinal ridges, and sometimes furnished with 

 a central style. Les Madrepores, Blainv. Phytocorallia dodeac- 

 tinia, Ehr. 



Fam. 1. PociLLOPORiD^, Gray, Syn. B. M. 1842, 130. 



Coral hard, solid, brittle, spinulose or gi'anulated; cells 6-sided, 

 simple, shallow, ciliated or spinulose. 



Seriatopora, Lam. Pocillopora, Lam. Stylopora, Schw. (Si- 

 deropora, BL, and Anthopora, Gray.) 



Fam. 2. Stylasterid^. 

 Coral minutely porous ; cells deep, cylindrical, with six grooves, 

 each ending in a pore and a central style. 

 Stylaster, Gray. 



Fam. 3. Madreporid^e, Gray. 



Coral porous, spongy and rough ; cells deep, circular, with six 

 or twelve longitudinal folds, immersed or produced, subcylindri- 

 cal, and without any central style. 



Madrepora, Lam. Heliopora, Bl. Asteriopora, Bl. Monti- 

 pora, BL Millepora, Linn. (Palmipora, BJ.) 



Fam. 4. Poritid^, Gray. 



Coral very porous, spongy and rough ; cells many-sided, with 

 granulose edges, more or less incomplete filamentose or spinu- 

 lose lamellse, surrounded by pierced or netted parietes. 



Porites, Lam. Alveopora, Bl. 



2. Animal many-rayed, and with many tentacles, placed in two 

 or more series ; coral cells with 12 or more radiating plates. Les 

 Madrepores, Blainv. Zoocorallia and Phytocorallia Polyactinia, 

 Ehrenb. 



