Anthozoa (incl. Hydrocorallia). C. Hydrocorallia. 37 



Siphonozooids are present on the dorsal face in two longitudinal series on 

 each side, those of the inner series being better developed than those of the 

 outer. Adjacent to each leaf there is an inner and an outer siphonozooid. 

 Four large canals extend along the whole length of the animal and communicate 

 with the exterior the dorsal one by means of the inner siphonozooids, the 

 lateral ones by means of the autozooids and lateral siphonozooids, and the 

 ventral one by means of numerous ciliated tubes the apertures of which are 

 present on the ventral surface of the rachis. The great number of these tubes 

 (there may be as many as 12 between two leaves) contrasts with the exceptional 

 reduction in the number of siphonozooids. The axis is rigid, impregnated with 

 calcareous matter, and circular in section. The animal is near Scytalium Herklots, 

 and also, in some respects, resembles Virgularia. The new genus is clearly 

 distinguished by its leaves being less and less developed in the inferior portion 

 of the rachis, by the circular section of the axis and the complete' absence 

 of spicules. - See also Gravier( 2 ). 



C. Hydrocorallia. 

 See Deninger. Seurat. A. Tornquist. 



