116 



nuous ( or jointed?) horny axis , which does not effervesce in niu- 

 riatic acid. 



Farn. 1. G or gotiiadae. Bark granulär persistent, with siin- 

 ken irregulär -shaped spiculae , with a more or less dislinct groove 

 down each side, and with the cells in series one each side of the 

 branchlets. 



f Coral arborescent or reticulated; cells on side of the bran- 

 chlets. Gen. Gorgonia (arborescent, branchlets snbcompressed ; cells 

 on side, moderate), Pterogorgia (arborescent, branchlets much coni- 

 pressed , cells niinute, on edge), Rhipidogorgia (reticulated, fan-like, 

 cells on sides). 



ff Coral frondose; cells on surface of frond. Gen. Hymeno- 

 gorgia (axis branched, filiform, branches separate), Phyllogorgia (axis 

 branched , filiform, branches netted), Phyllogorgia (axis expanded 

 foliaceous, thin). 



Farn. 2. Plexaur idae. Bark granulär, persistent, cork-like, 

 withont any imprcssed lateral groove. Cells placed cqually on all 

 sides of the branches. Gen. Plexauia (Bebryce ; cells not raised, 

 simple), Rhinogorgia (cells not raised, bounded by a conical process), 

 Eunicea (cells more or less produced, simple), Gonidora (cells con- 

 vex ; mouth radiated). 



Fam. 3. Mtiriceidae. Bark composed of large imbricate cal- 

 careous spiculae, without any lateral grooves. Cells equally on all 

 sides of the branchlets. Gen. Muricea, Plocmus (?). 



Fam. 4. Acanthog orgiada e. Bark thin, formed of siender 

 filiform spiculae, without any lateral grooves. Cells campanulale, on 

 all sides of the branches, with ridges of elongated spiculae, and 

 with a number of elongate setaceous spines on ihe margin. Gen. 

 Acanthogorgia. 



? Fam. 5. Antipathidae. Bark fleshy easily deciduous, soft 

 simple, only strenglhened by large and small scattered silicious (?) 

 plates. Gen. Leiopathes, Antipathes. 



Fam. 6. Sarcogorgiadae. Bark fleshy, when dry, skin-like. 

 smooth, without spiculae; the edges of the cells strengtheed with gra- 

 nulär spiculae. Gen. Sarcogorgia. 



**"' Sarcophyta. Coral arborescent lobulated or expanded, only 

 strengthened by internal or external calcaveous spiculae, which effer- 

 vesce in acid. 



Fam. 1. Briar eidae. Coral arborescent, fleshy, supported 

 by a central axis formed of numerous intertwined fusiform spiculae. 

 Gen. Briareum. 



Fam. 2. Alcyoniadae. Coral arborescent or lobed , fleshy, 

 strengthened with imbedded calcareous spiculae. Cells simple. Po- 



