VII.] 



ACETABULARIA. 



165 



The two genera Acetahularia and GymopoUa may be briefly 

 described as recent types which are represented by trustworthy 

 fossil forms. 



Fig. 34. Acetahularia mediterranea Lamx. From a specimen in the 

 Cambridge Botanical Museum (nat. size). 



Acetahularia. Figs. 33, I, and 34. 



With the exception of ^. mediterranea Lamx. (fig. 34) the 

 few living species of this genus are confined to tropical seas. 



The habit of Acetahularia is well illustrated by the photo- 

 graph of a cluster of plants of A. mediterranea Lamx.^ reproduced 



1 Lamouroux gives a figure of Acetahularia, and includes this genus with 

 several other algae in the animal kingdom (Lamouroux [21] p. 19, PI. lxix.). 



