of the Fishery Board for Scotland. 



287 



out the year, and, as formerly mentioned, are the cause of phosphorescence 

 in the water on certain occasions. This genus (Ceratium) has been con- 

 sidered by various authors as algoid, e.g., by Dr John Murray in the 

 Report of the 1 Challenger,' and by F. Schiitt in the recent Plankton 

 Expedition of the German Government.* On the other hand, Gourret f 

 and Pouchet f maintain more or less their relationship with the cilio- 

 flagellate Infusoria. 



The abundance of plant-life in the inshore waters of this area is a pro- 

 minent feature. Diatoms, algae in multitudes, and resembling those 

 named, Antelminellia, Ckcetoceras, Pyxilla, Bacteriastrum, and the 

 various forms of Rhizosolenia, occur constantly in the nets. The abun- 

 dance of the latter form occasionally causes a greenish discoloration of 

 the water. § 



* Reisebeschreibung der Plankton- Expedition, von Dr Otto Kriimmel, &c. Kiel 

 u. Leipzig, p. 266, &c, 1892. 

 t Ann. du Muse'e Hist. Nat. Marseille, 1883. Ik No. 8. 

 X Jour, de VAnat. et Physiol., 1883, p. 399. 



§ I am indebted for much assistance in the preparation of the following tables to 

 Mr J. Pentland Smith, M.A., B.Sc., now of the Horticultural College, Swanley, 

 Kent, who conducted the examination of the contents of the tow-nets with great 

 ability and punctuality. 



T 



[Tables. 



