TRIBE L ASTR^ACEA. 279 



Foliaceous, erect, bifacial, undulate. Corallum very thin, on each 

 surface fine striate and spinuloso-asperate, with scattered cells 

 scarcely tumid, 6 to 8 rayed. 



Plate 17, fig. 3, corallum, natural size ; 3 a, cell of the same. 



Sooloo Sea, East Indies. Exp. Exp. 



The specimen of this species in the collections is a single undulate 

 folium, four inches high and five broad, in no part more than an 

 eighth of an inch thick. It is very firm and solid in texture and 

 rings when struck. The cells are on both surfaces and have a dia- 

 meter of nearly one and a half lines. The spinules of the surface 

 are solid. It was attached by one side. 



2. ECHINOPORA ROSULARU. (Lamarck.) 



E. explanato-foliacea, suborbiculata, unifrons. Corallum supra striato- 

 asperum, caliculis echinatis ; infra, striatum. 



Explanato-foliaceous, suborbiculate, unifacial. Corallum above striato- 

 asperate, calicles echinate, below striate. 



New Holland Seas. Peron and Lesueur. 



Lamarck states that the species forms undulate expansions a foot 

 or more broad, and appears to have been attached below by the 

 middle. 



Echinopora rosularia, Lamk., ii. 397, , Lamouroux, Encyc., 297. 



No. 1. Echinastrcea rosularia, Blainville, Man., 

 , Schweigger, Beobacht. tab. 7, fig. 379, pi. 56, fig. 2. 



64 ; also, Handb., p. 415. 



3. ECHINOPORA RINGENS. (Lamarck.) Blainville. 



E. subturbinatum, lobalum. Corallum cettis irregularibus, subconfluen- 

 tibus, sinuosis, contiguis ; margine crasso, convexo. 



Subturbinate, lobed. Corallum with irregular cells, subconfluent, 

 sinuous, contiguous ; margin thick, convex. 



