52 



Part first. 



Tank No. 25. 



Fishes. Sea horse (fig. 154) and Pipe-fish (fig. 153). 



Plants. Sea-grass {Posidonia with broad fronds, and Cymo- 

 docea with narrow) and other algae {Sargassum, Cystoseira). 



Fig. 153. Syngnathus acus (Pipe-fish), 1/2 nat. size. p. 112. 



Fig. 154. Hippocampus guttulatus (Sea-horse), 

 1/2 nat. size. p. 112. 



