ON PLANKTON PROM NEW BRUNSWICK. 283 



Plate XLIV. 



Fig. 23. Argulus personatus (p. 271). Posterior three swimming-legs to show 

 accessory copulatory apparatus. X 60. 



24. ,, ,, Anteniiule and antenna. X 60. 



25. „ „ Maxilliped. X 60. 



26. Argulus angusticeps (p. 273). Antennule and antenna. X 60. 



27. „ „ Maxilliped. X 60. 



Plate XLV. 



Fig. 28. Argulus striatus (p. 274). Posterior two swimming-legs to show 

 accessor}' copulatorj'- apparatus. X 40. 



29. „ „ Antennule and antenna. X 60. 



30. „ „ Maxilliped. X 60. 



31. Argulus ruhescens (p. 276). Antennule and antenna. X 60. 



32. „ „ Maxilliped. X 60. 



22. Notes on Plankton collected across the mouth o£ the 

 St. Croix River opposite to the Biological Station at 

 St. Andrews, New Brunswick, in July and August 1912. 

 By Arthur Willey, M.A., D.Sc, F.R.S., F.Z.S., 

 McGill University, Montreal, 



[Received January 8, 1913 : Read March 4, 1913.] 



(Text-figures 54 & 55.) 



Index. 



Geographical Zoology : Page 



FritilJaria 284 



Copepoda 284 



Cladocera 285 



Peridinimn 285 



Ethology : 



Brachiolaria 286 



Morphology : 



Bolina and position of Ctenoplana 288 



Systematic : 



Actinotroeha and Phoronis hrownei Selys-Longchamps 290 



The marine Plankton of the Atlantic coast of Canada has been 

 examined quaHtatively by Professor Ramsay Wright ("The 

 Plankton of Eastern Nova Scotia Waters," 39th Ann. Rep. Dep. 

 Mar. & Fish. : Further Contributions to Canadian Biology 1902- 

 1905. Ottawa, 1907, pp. 1-19,7 plates); and the Phytoplankton 

 more particularly by Professor L. W. Bailey ("The Marine and 

 Estuarine Diatoms of the New Brunswick Coasts," Bulletin Nat, 

 Hist. Soc. New Brunswick, No. 28, vol. vi. 1910, pp. 219-239, 

 2 plates). 



The estuarine or tidal Zooplankton off the mouth of the 

 St. Croix river does not seem to have received special attention 

 hitherto. As for the quantitative determination of this tidal 

 plankton, and the systematic tabulation of its periodical fluc- 

 tuations, an endless field of work is offered to the investigator. 

 Samples taken in a tow-net weighted to a depth of 3-5 fathoms 



19* 



