PLANKTON OF THE GULF OF MAINE 



305 



Percentages of the several species of copepods in samples from the horizontal hauls, December, 1920, and 

 January and March, 1921, identified and tabulated by Dr. C. B. Wilson — Continued 



Supplementary note on the copepods 60 



Since the preceding account of the copepods was written, Dr. C. B. Wilson has 

 made a further examination of the tow nettings of 1920 and 1921 and communicates 

 the following notes on additional species detected. Most of these appear only in 

 very small numbers. One. however — Oiihona similis — is plentiful enough to suggest 

 that it will prove widespread in the gulf. 



Aegisthus mucronatus. — A single female was obtained from a vertical haul at 

 station 20069, March 12, 1920, southeast of Georges Bank. 



Alteutha depressa. — About a dozen of these peculiar harpactids, which look very 

 much like sowbugs, were taken in a vertical net at station 20117 on April 17, 1920, 

 close to the eastern shore of Cape Cod. 



Amallophora magna. — Three females taken in a vertical net just off the southern 

 edge of Georges Bank, February 22, 1920, station 20044. 



Calamus minor. — Ten of these tiny calanids were taken at the surface between 

 the eastern end of Georges Bank and Nova Scotia, April 16, 1920, station 20106. 



Calanus tonsus.- — Six females were taken in a vertical net off the eastern end of 

 Georges Bank, April 16, 1920, station 20107. 



C'andacia norvegica. — Three females were captured at the surface off the southern 

 edge of Georges Bank, May 17, 1920, station 20129. 



Chiridius armatus. — Eight specimens, including both sexes, were taken in a 

 vertical net southeast of Nova Scotia, March 19, 1920, station 20077. 



» Communicated by Dr. C. B. Wilson. 



