322 THE PROCEEDINGS OF THE LINNEAN SOCIETY 



neighbouring specimens touching each other become intimately 

 united by their walls. This spurious compoundness is caused by 

 contact and not by fissiparity. There can be no doubt that 

 Hornophyllia remains solitary at all ages." 



It occurs to me that there is a close relation between the 

 genus thus described and Gylicia of the Astrangiacese, of which 

 already three species are described from South Australia. 



Third Division Astrceacea or Astrcea which have a massive 

 corallum whose corallites intimately united by their costaa or 

 walls multiply essentially by budding, the individuals being dis- 

 tinct from their origin though sometimes budding in another 

 calice or near the central fossa, thus giving rise to a kind of 

 false linear arrangement. 



Genus Cyphastr^a, Ed. fy H., 1848. 

 Corallum a convex and gibbous mass broadly adherent ; costas 

 and exotheca much developed and forming a compact and very 

 dense tissue with a granular or hispid surface ; edges of calices 

 free and round ; columella papillose, conspicuous ; septa very 

 exsert, narrow ; laminee at the wall and divided into processes in 

 their internal moiety, with fine teeth which are largest near the 

 columella ; budding extra-calicinal. The very compact structure 

 at the muro-costal region, and the lax open tissue at the central 

 region easily distinguish this genus. The species are all small. 



Cyphastkjea micropthalma, Lamarck (Animal, s. vert., 2nd ed. t. 



2, p. 408.) 



Corallum gibbous, calices close, circular, salient; costae slightly 

 so ; interstices strongly granular ; columella papillose ; two 

 cycles with a third in two or four systems in which the seconda- 

 ries equal the primaries, so that there are in appearance 8 to 10 

 simple systems ; septa slightly exsert, thick at the wall, thin 

 within, toothed with a little paliform tooth near the columella ; 

 in section it is seen that the wall and exothecal dissepiments are 

 thick and horizontal, but often lost in the general compactness 

 of the tissue; septa deeply divided into three long and ascending 

 teeth; endothecal dissepiments very thin, simple, close and hardly 

 sloping. Calices 1 } 2 mil. in diameter. 



