22 MARINE AND FISHERIES 



5 GEORGE v., A. 1915 



the latter of Rhizosolenia. In September there is a second small rise of Chaetoceros, 

 but Rhizosolenia was nearly wanting. The April rise is supposed by Sir John 

 Murray to be due to the increasing amount of sunlight at that time, but may 

 be due to variations in food supply. 



As the Biological Station at St. Andrews was open only during the months 

 of July, August and part of September, the opportunity for comparisons of this 

 kind was wanting. It will be obvious, however, that if similar variations in the 

 phyto-plankton of New Brunswick waters exist, as is probable, they must have 

 some effect upon the relative abundance, at different seasons, of the higher forms 

 of life, of which they are the food supply. 



EXPLANATION OF PLATES. 



Note — The figures in these plates have been drawn, with few exceptions, with the eye, as 

 seen under a \" in objective, but not to scale. 



Plate I. 

 Fig. 1 . Chaetoceros decipiens — Cleve. 



O (' « « 



3 . Chaetoceros decipiens — Cleve ? 

 4 « « « 9 



5. " " " Restiug spores. 



6. Chaetoceros sp? 



7 . " " Resting spores ? 



9. Chaetoceros chriophyllum. — Cast. 



10. " " " var. ? 



11. Chaetoceros Peru vianum — Bright? 



Plate II. 



Figs 1-2. Rhizosolenia setigera — Bright. 



3-4. " styliformis — Bright. 



5. " setigera ? 



6. " sp ? ' , 

 7.. " imbricata ? 



8. " ? (Ditylvun Brightwellii) ? 

 9-11. Triceratium undulatum — ^Bright ? 



12 . Skeletonema costatiun — Grev. 



13. Thalassiosira Nordenskioldii — Cleve 

 14-15. " sp ? 



18 . Asterionella. 



Plate III. 



Fig. 1-2, Chaetoceros boreale — Bail. 



3. Chain of auxospores of Chaetoceros decipiens ? 



4. Thalassiosira? 



5. " gravida — Cleve? 



