6 G. HERBERT FOWLER. 



tentacles ; they are not however, arranged in knobs or 

 u batteries." 



Zooxanthellse are present abundantly in the canals exterior 

 to the theca, in the tentacle cavities, and immediately under 

 the mouth disc ; elsewhere they are comparatively rare. 



iii. Summary. — The following are the most important points 

 elucidated : 



1. The polyps are of the normal Actinian type, and are 

 bilateral, but not rigidly bisymmetrical. 



2. The septa and tentacles (?) are entoccelic only. 



3. The number of septa present is inconstant, and bears 

 no relation to any multiple of six. 



4. The general body wall of the colony is supported upon 

 the echinulations of the ccenenchyme; a condition 

 which may be of secondary significance, acquired for the 

 purpose of such support, contemporaneously with and in 

 consequence of the development ofcoenenchyme. 



iv. Memoirs referring to the Genus : 



Milne-Edwards and Haime, ' Hist. Nat. des Coralliaires/ 

 iii, 164, pi. e i, figs, la, lb. 



KlunzingeRj ' Korallthiere des Rothen Meeres/ ii, 50. 



LorHOHELlA PROL1FERA (figS. 4 8). 



The material for a study of this form was entrusted to me 

 by Professor E. Ray Lankester, who had dredged it off Lervik, 

 Stordoe, Norway, and whom I am glad to be able thus to thank 

 for his generosity. Owing to the great density of its corallum, 

 and the consequent damage to the tissues produced by pro- 

 longed decalcification in a strongly acid medium, the work has 

 been long delayed. Part of the material had been placed 

 directly in absolute alcohol ; part was passed from corrosive 

 sublimate through successive strengths of spirit to 90 per cent, 

 alcohol. Both sets were in excellent preservation, but the 

 latter method appeared to be preferable, as resulting in less 

 shrinkage of the tissues. 



i. Corallum. — Of all corals this is probably the most generally 



