510 Scientific Proceedings, Royal Dublin Society. 



Plate XIX. 



Pre. 1 . — A brancli of a stock of coral from Limbe Island, ISTortli Celebes, 

 showing a very irregular arrangement of the pore system, and 

 a few systems at * that are circular as in other Hydrocorallines. 



Fig. 2. — An ideal longitudinal section through a gastrozooid {g%.) and two 

 dactylozooids (ffe.) of Bistichopora violacea. The calcareous 

 coenosteum (eoen.) is shaded. The long style in the gastrozooid 

 may be seen to be covered by a thin flattened layer of cells. 

 M., mouth. 



Fig. 3. — Longitudinal section through a small portion of one of the 

 dactylozooids showing the scalariform arrangement of the 

 endoderm (end.). 



Pig. 4. — The fragment of Stylaster gracilis I received from Professor 

 Haddon, showing the disposition of the gonophores {gon.) on the 

 flabellar surface of the stock. 



Fig. 5. — The termination of one of the branches of the same stock, showing 

 the manner in which the terminal cycle system is budded from 

 the one immediately preceding it. 



Plate XX. 



Fig 1. — Longitudinal section through one of the cycle systems of 

 Stylaster gracilis showing the centrally placed gastrozooid (</3.) 

 and one dactylozooid {d%.). The brush-like style of the 

 gastrozooid may be seen standing up in the centre of its cavity. 

 The coenosteum in this figure is shaded. 



Fig. 2. — A longitudinal section through a dactylozooid of Stylaster 

 gracilis more highly magnified. The coenosteum in this 

 figure is left unshaded. The dactylozooid consists of two 

 parts : a teat-like process (A) with solid scalariform endo- 

 derm, and (B) a muscular slip attached to the teeth of the 

 serrated style. 



Fig. 3. — A transverse section through a secondary branch showing the 

 female gonophores {gon.) on the coenosarcal canals (c.c), and a 

 gastrozooid {g%.) in transverse section. The coenosteum in this, 

 section is shaded. 



