115 



Trib. 4. Veretilleae. The coral club-shaped. The polypes on 

 all sides of Ihe club. Gen. Lituaria , Sarcobeleiiinon , Caverniilaria, 

 Veretillum. 



Trib. 5. RGDÜIeae. The coral expantled , foliaccous , with a 

 slender stalk. The polypes only onone siir face of the cxpanded disk. 

 Gen. Renilla. 



Farn. 2. Umb ellular iad ae. The body free, umbellate, with 

 a long stem and a simple central axis. The iipper pait with a dü- 

 ster of polype-beating cells placed in concentric seiies , forniing a 

 large head. Axis fusiforni elongate, as long as the stcni of the coral. 

 Gen. Unibellularia. 



II. Spongicolae or Hyalophyta. 



Subsynimetrical , iiving stinken by the base into a sponge, 

 strengthencd by siliceoiis spiculae and siipportet by a central axis, 

 formed of niimerous Iwisted clongatod silicious fibrcs. (Wir verwei- 

 sen hier auf die oben bei llyalonema zugefügte Bemerkung.) 



Farn. 1. Hyalonemidae. Gen. Hyalonema. 



III- Ropicolae. 



Coral tree-like or expanded, fixed by an expanded basc, sup- 

 ported by more or less fusiforin calcareous spiculae and öfter suppor- 

 ted by a central calcareous or horny tree-like axis with an expanded 

 base. Living attached by the base of the coral and axis to rocks on 

 the sea-shore. 



•^ Lifhophyta. Coral arborescent, supported by a conti nuous or 

 jointed calcareous axis, which efifervesces with muriatic acid. 



f Axis contlnuous, not jointed. 



Farn. 1. Coralliadae. Axis inarticulate, solid, continuous. 

 Bark granulär, with irregulär -shaped spiculae. Gen. Coralliuni, An- 

 nella, Ellisella (Juncella et Ctenocella), ? Gorgonella, Scirpearia, 

 Umbracella, Subergorgia. 



Farn. 2. Primnoadae. Axis inarticulate solide. Bark formed 

 of flat imbricate scales. Polype-cells prominent, covered with imbri- 

 cate scales. Gen. Prininoa, Callogorgia, Primnoella. 



ij: Axis articulated. 



Fam. 3. Melitaeädae. Axis spongy , permeated by flexuoiis 

 tubulär canals interrupted by harder swellen calcareous joints. Bark 

 granulär; cells in series on the edge of the branchlets. Gen. Melitaea, 

 Mopsella, ?Solanderia. 



Fam. 4. Isideae. Axis calcareous, solid, divided by narro- 

 wed horny joints. Bark granulär, with irregulär -shaped spiculae. 

 Gen. Isis (Cynosaire), Isidella, Mopsea. 



** Ceratophyia. Coral arborescent, supported by a conti- 



