PHYLUM C< ELENTERATA 



119 



None of the sea-anemones have a true skeleton ; in some, 

 however, there is a thick cuticle, and several kinds enclose 

 themselves in a more or less complete tube, which may be 

 largely formed of discharged nematocysts. In some Alcyo- 



Fig. 58. — Alcyonium palmatum. A, entire colony natural size; B, spicules. 

 Mediterranean Sea. (After Cuvier.) 



naria, such as the " dead men's fingers " {Alcyonium, Fig. 58) , 

 the skeleton consists of minute, scattered, irregular deposits 

 of carbonate of lime called spicules. Alcyonium carneum 

 occurs below tide-mark off the New England coast. In 

 Tubipora (the " organ-pipe coral ") (Fig. 59) there is a con- 



