G. KEKATOisiDiE. Braiichcs from the stony joints. Bark and cells 

 spinous. 



7. IsiD^. Branches from the stony joints. Bark thick ; cells minute, 



scattered over all the surface, sunken. 



III. Axis continuous, calcareous; the apex of tJie branchlets calcareous. 



8. CoEALLIDiE. . '' 



IV. The axis continuous, hard, corneo-calcareous ; the apex of the 



branchlets often horny and flexible, 



a. Baric granidar, thin ; polype-ceUs more or less prominent. 



9. Ellisellad^e. '' - ■ 



b. Barh formed of imbedded calcareous spicules ; cells prominent, 

 covered with spicides, and adpressed to the sides of the stem. 



10. Hypnogorgiad-^. 



c. Bark formed of seed es ; polype-cells prominent. 



11. Calligorgiai».e. Polype-cells tubular, in series on the sides 



or round the branches. 3 . .■ 



12. Calypthophorad^. Polype-cells peduncled, formed of two cones, 



in whorls round the stem. 



13. Primnoad^. Polype-cells peduncled or sessile, covered with 



scales, in whorls round the stem. . .; ^ 



Section I. Axis articulated, calcareous, stotiy ,v articulations swollen, spongy 

 or cork-like ; buds and branches from the s2VoUen articulations. 



Fam 6. MELITH^AD^. 



Coral branched, on a plane ; branches furcate, often anastomosing. 

 Axis articulated, permeated by flexuous cylindrical canals, inter- 

 rupted by harder swollen calcareous articulations ; the joints and 

 articulations at length solidifying into a continuous hard axis per- 

 meated by small tubular canals. Bark granular. Polypiferous cells 

 small, in series on the edge of the stem and branches. 



Melitfea, Lamx. Polyp. Flex. 181G, p. 461 ; Lamk. Mem. Mus. i. 



p. 410; A.s. V. ii."p. 270. 

 MelithfBa, Milne-Edw. Corall. i. p. 199. 

 Melitea, Warne, Corall. p. 229. 

 Melitfeadc^, Gray, P. Z. S. 1857, p. 284 ; Ann. ^ May. Nat. Hist. 



1859, iv. p. 442. 



Dr. Kblliker calls the canals in the axis " food-canals." 



b2 



