120 



A NATVBALI8T IN CELEBES 



have had altogether insufficient information to work upon, 

 and have in consequence raised to the dignity of separate 

 species many forms which it is only necessary to consider 

 as local varieties of the same. 



M 



t 



Fia. 13.— Diagram to illustrate anatomy of Oalacea Esperi. 



A, afuU-gro-wn polype divided longitudinally to exhibit the internal anatomy and the rela- 



tion of the hard parts to the soft. 



B, a yoimg hud divided transversely and the upper portion removed. 



S.^., basal plate of lime; th, theoa, and SS, septa oj lime; tt, tentacles; M, mouth; 

 St, stomodffium or throat ; O c, general cavity of the polype ; m, mesentery ; m. f., me- 

 senterial filament ; /. I., fleshy lamina covering the upper surface of the basal plate. 



A description of the accompanying diagrammatic figures 

 will perhaps make the complicated organisation of these 

 polypes a little clearer. The skeleton or hard parts of an 

 imperforate coral Galacea consists of a hasal or encrusting 

 plate (b.p.) upon which stands a number of -cylindrical cups 



