TRIBE II. CARYOPHYLLACEA. 407 



rallum porosum, cellis immersis, 2'" latis, polygonis, compressis, 

 conicis ; lamellis cequatibus, denticulatis ; margins, rugosis. 



Subglobose, polyps much exsert, grayish, tentacles green. Co rail urn 

 porous, with immersed cells, 2 lines broad, polygonal, compressed, 

 conical ; lamellae even, denticulate ; margin rugose. 



Island of Vanikoro. Quay $ Gaymard. 



This species is added to the genus with hesitation. Quoy and 

 Gaymard describe it as occurring in rounded or ovoidal masses, as 

 large as a pear; its cells quite deep, with the sides vertical. The 

 polyps are salient, more than half an inch, with a prominent (tres- 

 developpe), buccal disk. The species has much analogy with the 

 Goniopores, but the deep cells with denticulate lamellae are peculiar. 



Astrcea viridis, Quoy and Gaymard, Voy. de 1'Ast., iv. 204, pi. 16, figs. 1-3. 



NOTE. The genus Goniopora is placed in the family Poritidae, on the ground of a 

 general similarity of the polyps and their coralla, to those of the Porites. Yet it may be 

 equally proper, if not more so, to add them in this place, and consider them the represen- 

 tatives among the Caryophyllacea, of the Porites, in the tribe Madreporacea. 



FAMILY III. GEMMIPORID^. 



Caryophyllacea polyporum discis latis, sape convexis el margine tenta- 

 culatis, tentaculis brevibus. Coratta porosa, super fide non striatd; 

 cellis margine parietibusque crassis ; lamellis indusis, angustis etfere 

 cequalibus. 



Caryophyllacea with broad, often convex, disks to the polyps, having 

 the tentacles marginal and short. Coralla internally porous, surface 

 granulous and not striate, margin and sides of the cells stout ; la- 

 mellae included, narrow and neatly even. 



