MELITHJ5AD2E. 6 



6. KERATOISLD^. Branches from the stony joints. Bark and cells 



spinous. 



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



scattered overfall the surface, sunken. 



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



8. CORALLIDJE. 



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



branchlets often horny and flexible. 



a. Baric granular, thin ; polype-cells more or less prominent. 



9. ELLISELLADJE. 



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

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



10. HYPNOGOEGIADJS. 



c. Baric formed of scales ; polype-cells prominent. 



11. CALLIGORGIADJE. Polype- cells tubular, in series on the sides 



or round the branches. 



12. CALYPTROPHORAD^:. 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, stony ; articulations swollen, spongy 

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



Fam, 6. MELITH^AD^E. 



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. 



Melitsea, Lamx. Polyp. Flex. 1816, p. 461 ; Lamk. Mem. Mus. i. 



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

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

 Melitea, Warne, Corall p. 229. 

 Melitfeadffi, Gray, P. Z. S. 1857, p. 284 ; Ann. $ Mag. Nat. Hist. 



1859, iv. p. 442. 



Dr. Kolliker calls the canals in the axis tf food-canals." 



