22 A MANUAL 



and every tentacle shot out its many- coloured lights 

 among the i^ink corallines and the dark tresses of 

 the sea-weeds. 



You will have a few more questions to ask, and 

 we will (to save time) set them down in a tabular 

 form, heading them by the questions we have already 

 asked, and they will be always at hand for future 

 reference. 



Helianthoids (" Sunflower-shaped Zooi)hytes"). 



1. Is your specimen covered with a hard shell of 

 lime adhering to the rock ? 



Then it is a coral. 

 2. Is its body fleshy and its skin firm ? 



Then further 



A. Are the individual polyps united at the base 



by a fleshy band ? 

 Then it is a Zoanthus. 



B. Are the individuals quite single ? 

 Then further — 



a. Are the tentacles in tufts, at distant in- 

 tervals ? 

 Then it is a Lucernaria. 



h. Are the tentacles in uninterrupted circles ? 

 Then it is a " sunbeam" or an Actlnoid. 

 If an A ctinoid — 

 1. Are the tentacles without a hole or outlet at their 

 extremity ? 

 Then he is a Caj)nca or a Corynactis. 



