THE PLANKTON DIATOMS OF THE BAY OF FUNDY 



21 



SESSIONAL PAPER No. 39b 



B. laevis, B. rhombus and B. Mohiliensis {=B. Bailey i) Figs. 20-23 of which the 

 latter, at some points along the Bay of Fimdy coast, makes up nearly the whole 

 of the plankton, occurring in vast numbers. B. aurita (Fig. 19) is also common, 

 while B. laevis and B. rhombus Figs. 21-22 are comparatively rare. 



The following genera and species of Diatoms, though less distinctly planktonic 

 than the preceding, are met with in more or less frequency in tow net gatherings. 



Fra gillaria capucina — Des. 

 Acnanthes longipes — Ag. 

 Acnanthes subsessilis — Kutz. 

 Amphiprora alata — Kutz. 

 Bacillaria paradoxa — Gmel. 

 Campylodiscus 

 Cocconeis scutellum — Ehr. 

 Cyclotella compta — Kg. 

 Epithemia musculus — Kutz. 

 Grammatophora marina — Kutz. 

 Grammatophora serpentina — Ehr. 

 Isthmia nervosa 

 Licmophora Lyngbei — G. 

 Melosira nummuloides — Kutz. 

 Melosira Borerii — Grev. 

 Navicula Smithii 

 Navicula didyma — Kutz. 

 Navicula viridis — Kutz. 

 Nitschia bilobata — W. S. 

 Nitschia closterium— W. S. 

 Nitschia sigmoidea — W. S. 

 Nitschia vermicularis — Hanty. 

 Nitschia sigma — W. S. 



Pleurosigma angulatum — W.S. 

 Pleurosigma attenuatum — W. S. 

 Pleurosigma Balticum — W. S. 

 Pleurosigma fasciola — W. S. 

 Pleurosigma strigilis — W. S. 

 Pleurosigma strigosum — W. S. 

 Pleurosigma acuminatum. 



Rhabdonema arcuatum — K. 

 Rhabdonema Adriaticum — K. 



Schizonema crucigerum — W. S. 

 Stauroneis anceps — Ehr. 

 Stauroneis obliqua. 

 Striatella unipunctata — Ag 

 Surirella gemma — Ehr. 

 Surirella ovalis — Breb. 

 Synedra ulna — Ehr. 

 Synedra undulata — Bail 

 Synedra longissima. 

 Synedra radians — W. S. 

 Tabellaria. 



Nitschia longissima — Ralfs. 



No quantitative measurements have as yet been made to determine the 

 relative abundance of plankton Diatoms at different localities in New Brunswick 

 or at different seasons. It is, however, interesting to note in this connection the 

 results of observations made by Prof. W. A. Herdman, F.R.S., and others in the 

 waters about the Isle of Man. Dr. Herdman states that in a single haul made in the 

 latter part of April, 49 millions of the genus Chaetoceros were found. The maximum 

 however, w as in August, while in late September the number had fallen to 3 millions, 

 and in October was only one million. Rhizosolenia was feeble in April, reached 

 its maximum (13 millions) in June, was absent in August, and had a second maxi- 

 mum (470,000) in late September. Lauderia (L. borealis) was rare until April, 

 was absent in August, reached a maximum (20 millions) on April 22, and was 

 rare throughout the summer. Biddulphia, chiefly Bid. Mohiliensis had its maxi- 

 mum in April. 



Of Diatoms in general there was a marked minimum in August while the 

 maxima were in August and June, the former consisting chiefly of Chaetoceros and 



