HOW TO KNOW THE SEAWEEDS 



162. Rhodomela 



p. 66, fig. 78 



163. Herposiphonia 

 p. 66, fig. 79 



164. Lophosiphonia 

 p. 53, fig. 54 



165. Polysiphonia 



pp. 53, 67, figs. 54, 80 



166. Pterosiphonia 

 p. 67, iig. 81 



167. Pterochondna 

 p. 68, fig. 82 



168. Odonthalia 



p. 170, fig. 226 



169. Digenia 



p. 54, fig. 55 



191 



