24 PROCEEDINGS OF THE NATIONAL MUSEUM vol.80 



EURYTEMORA AMERICANA Williams 



Eurytemora americana Wiluams, Amer. Nat., vol. 40, p. 645, figs. 8-11, 1906. 



Occurrence. — Found at two stations at the mouth of the bay and 

 at six stations in the inner bay, but not taken in the outside ocean. 

 Not an abundant species and confined to winter and early in spring. 



Remarks. — Not recorded by any author since Williams, 1906. In 

 the present survey only a few specimens were obtained at the mouth 

 of the bay, but about 150 were taken in each of two hauls with a 

 bottom net in the inner bay, in 9 or 10 meters of water over a muddy 

 bottom. Two other species of this genus were mentioned by Profes- 

 sor Willey as important factors of the stomach contents of shad 

 caught in Nova Scotia waters. If the shad there consume the local 

 species of Eurytemora.^ there is no reason why they should not do 

 the same in Chesapeake Bay. 



EURYTEMORA HIRUNDOIDES (Nordquist) 



Temorella affinis var. hirundoides Nordquist, Die Calanideu Finlands, p. 48, 



pi. 4, figs. 5-11, pi. 5, fig. 5, 1888. 

 Eurytemora hirundoides G. O. Saks, Crustacea of Norway, vol. 4, p. 102, pi. 69, 



1902. 



Occur re nee. — ^Widely distributed in the inner bay, but only spar- 

 ingly in the outer bay; found most abundant at Station Z in water 

 13 meters deep on a muddy bottom. In three hauls made on March 

 27, 1921, it formed 25 per cent of the surface net total, 20 per cent 

 of the vertical net total, and 15 per cent of the bottom net total 

 estimated at 100,000 specimens. 



Remarks. — This is a brackish-water species, which explains why it 

 is so much more numerous in the inner bay. Its abundance there 

 makes it one of the most important constituents of the plankton. 



LABIDOCERA AESTIVA Wheeler 



Labidocera aestiva Wheeler, Bull. U. S. Bur. Fisheries, vol. 19, p. 178, fig. 16, 

 1900. 



Occurrence. — Distributed universally in the outer bay, sparsely in 

 the inner bay, captured usually in the bottom net, but taken also at 

 the surface. Most abundant in autumn, especially in the inner bay, 

 but present also in summer and winter in the outer bay and at the 

 surface of the outside ocean during summer. 



Remarks. — This copepod was recorded by both Wheeler and Fish 

 as a summer form at Woods Hole, whence its specific name. In Chesa- 

 j)eake Bay it is just as distinctly a winter and autumn species. It 

 was found in sufficient numbers in the outer bay to constitute an 

 important factor of the plankton, but in the inner bay it occurred so 

 sparingly that it was seldom credited with a percentage mark. 



