No. 10. — Oceanography and Plankton of Massachusetts Bay and 

 adjacent loaters, November, 1912-May, 1913. 



By Henky B. Bigelow. 



CONTENTS. 



Introduction . . . . . ... 



Temperature and salinity south of Cape Ann 



Temperature and salinity north of Cape Ann, March and April 



Temperature and salinity on Georges Bank 



General discussion 



Plankton notes .... 



List of copepods By C- O. Esterly 

 List of hj-periid amphipods . 

 List of euphausiids 

 Plankton from Georges Bank 



Table of temperatures and sahnities, Blue Wing Stations 

 Table of temperatures and salinities, W. W. Welsh Stations 

 Table of temperatures and salinities, Massachusetts Bay to Georges 

 Bank .......... 



PAGE. 



385 

 386 

 393 

 399 

 400 

 403 

 409 

 410 

 410 

 414 

 416 

 417 



419 



Introduction. 



During the winter and early spring of 1912-1913 the Bureau of 

 Fisheries Steamer Blue Wing carried on oeeanographic investigations 

 in Massachusetts Bay, under my supervision, continuing the work of 

 the Grampus during' the summer of 1912 (Bull. M. C. Z., 1914, 58, 

 p. 29-148). It was planned to make a trip every two weeks to a 

 locality some eight miles soutli of Gloucester, in 35-40 fathoms; and 

 also a few \isits to Ipswich Bay, and to the waters off Cape Ann ; but 

 the frequent gales which made the season an exceptionally rough one 

 interfered more or less with the program. This work was supple- 

 mented by Mr. W. W. Welsh, of the Bureau of Fisheries, who took 

 temperatures, water samples, and tows at 32 stations, chiefly north of 

 Cape Ann, during March, April, anfl May, while investigating the 

 spawning habits of the coast schools of haddock. And a few tempera- 

 tures, water samples, and tows were also taken on George's Bank, by 

 Mr. W. F. Clapp, of the Museum of Comparative Zoology, and by 

 Mr. Douthart, of the Bureau of Fisheries. 



