254 BULLETIN OF THE BUREAU OF FISHERIES 



found it at 76 per cent of all the stations east and north of Nantucket in the summer 

 of 1913 and at 60 per cent of the July-August stations of 1914. The year 1915 

 yielded M. lucens in the vertical hauls at 58 per cent of the stations right through 

 the season, irrespective of locality in the gulf (table, p. 297), and 1920 and 1921 were 

 the best years, with M. lucens occurring at 84 to 85 per cent of the stations, both 

 for the spring months and for December and January. In addition to the captures 

 of this species on the recent cruises of the Grampus, Albatross, and Halcyon, Wheeler 

 (1901, p. 176, as " M. Mbernica") describes it as very common in Plymouth Harbor, 

 Mass., in August, 1899, while Dr. A. G. Huntsman (Willey, 1919) and Dr. J. P. 

 McMurrich 40 have taken it frequently in the neighborhood of St. Andrews. 



Plotting the stations at which M. lucens has and has not been taken (fig. 77) 

 shows that it occurs over the whole extent of the Gulf of Maine, on the offshore 

 banks as well as inshore, across the whole breadth of the shelf off Marthas Vine- 

 yard, and along the continental slope; and although we failed to find it in the 

 harbors of Gloucester, Rockport, Kittery, or Portland during July and August, 

 1912, its presence in Plymouth Harbor and at St. Andrews proves that it inhabits 

 estuarine and inclosed waters as well as the open sea. The rather confused picture 

 presented by the chart of distribution is simplified if the records be classed as summer- 

 autumn and winter-spring, for all the years combined, and if the gulf be divided 

 as follows: 



1. Coastal zone out to 150 meters, Cape Cod to Grand Manan. Summer- 

 autumn, present at 53 per cent of the stations; winter-spring, present at 70 per cent 

 of the stations. (In the Massachusetts Bay region it was present at 77 per cent 

 of the summer-autumn stations.) 



2. Off Lurcher Shoal. Occurred at all the stations, both summer-autumn and 

 winter-spring. 



3. Coastal banks west of Nova Scotia, out to German Bank. Occurred at all 

 the stations, both summer-autumn and winter-spring. 



4. The basin in general, west of longitude 68° 30'. Summer-autumn, at 56 per 

 cent of the stations ; winter-spring, at 73 per cent. 



5. Basin in general, east of longitude 68° 31' W, including the Fundy Deep. 

 Summer-autumn, 75 per cent of the stations; winter-spring, 75 per cent. 



6. Northern channel. Occurred at all the three stations for which the copepods 

 have been listed, spring and summer. 



7. Browns Bank. Occurred at one of two stations in summer, and at the two 

 spring stations for which the copepods have been listed. 



8. Eastern channel. Occurred at all the stations, four in number, for which 

 copepods have been listed, summer as well as spring. 



9. Eastern half of Georges Bank, east of longitude 68° W. Present at one and 

 absent at one summer station; present at all five spring stations. 



10. Georges Bank west of longitude 68° W, and continental shelf off Marthas 

 Vineyard and Nantucket. Present at three of eight summer-autumn stations for 

 which the copepods have been listed and at one station in July, 1916; present at 

 all three winter-spring stations. 



18 In his unpublished lists of the plankton for St. Andrews. 



