CHLOROPHYCE^ 187 



examined fresh from the surface, and becomes 

 coloured brown with iodine solution, but with iodine 

 and sulphuric acid no blue colour was observed. 

 They were never observed to colour with carmine 

 solution. When the calcareous parts are removed by 

 dilute acids a small gelatinous sphere remains, in the 

 outer layer of which the Coccoliths or Rhabdoliths 

 were embedded." (" Challenger Reports." Narrative, 

 vol. i. p. 939.) 



