182 NATURAL HISTOEY OF 



Colour. Yellow, with rosy-white tentacles and white 

 disc. 



The tentacles number 120 in four rows. The tips 

 are knobbed, and are sometimes two-lobed. The 

 tentacles are short and thick, and generally borne 

 horizontally. " They resemble a coronet of pearls.^' 



FAMILY V. ZOANTHIN^ (Zoanthe^). 



Actiniaria with numeroiis septa of different Mndi^, 

 small imferfect microsepta and large perfect macrosepta, 

 ivith reproductive organs and mesenteric filaments. Ani- 

 mals forming colonies. — Heetwig and Andres. 



Sub-family I. Zoanthidje, Gosse. 



Animals forming colonies, the individuals of which 

 are connected hij endodermal canals, which run out from 

 the gastric space at the lovjer end of each polyp. — 

 Heetwig, 



Genus I. Polythoa, Klunz. 



Colonies connected by a slightly developed ccenen- 

 chyma, consisting either of a plexus of stolons or a thin 

 plate, the polyps projecting to a considerable height 

 above the coenenchyma, which is invested with sand. 



1. P. Arenacea, De Chiage. " The Sandy Creeplet." 



Dysidea papillosa {G. J.), Sidisia Bai-leei {Gray), 

 Zoanthus Couchii {G. J., D. L., P. H. G., 8)'c.). 



Hab. : Northumberland [Aid.), Torquay {Holdsworth), 

 Cornwall (Couch). Height | — | in. 



Colour, (a) Linearis: Pale brown, with transparent 

 white-tipped tentacles, having the root-band as a narrow 

 ri])bon. (b) Biffusus: Having the root-band spread 

 over a shell as a continuous carpet, (c) Liber : Un- 



