THE CRUSTACEA OF NEW JERSEY. 133 



bright red. It also reaches a rather large size, as Sars says 

 Arctic specimens attain 5 mm. in length. He further adds, "of 

 all the marine Calanoids of Norway this form is by far the 

 most common, often occurring in enormous shoals, and thus 

 sometimes giving the sea a conspicuously reddish hue. It is 

 found everywhere in the open sea, more frequently at the very 

 surface, though at times it may also descend to greater depths, 

 or be carried by the waves and currents towards the shores or 

 into the bays and fjords. * * =i= jj- moves rapidly, with 

 abrupt bounds caused by energetic strokes of the natatory legs. 

 At times, however, it is seen quietly suspended in the water, 

 with the anterior antenna; spread out to each side at right angles 

 to the body, or proceeding- slowly by rapid vibrations of the 

 posterior antennae and the mandibular palps. The male is still 

 more agile than the female, and the motion effected by the pos- 

 terior antennae and mandibular palps is more energetic, in ac- 

 cordance with the somewhat strong'er development of these 

 appendages and the pertaining muscles, being changed to a some- 

 what jerky leap through the water. At some seasons male speci- 

 mens are by no means rare, though the female sex always pre- 

 ponderates considerably in number. This Calanoid is eagerly 

 devoured by some of our common food-fishes, for instance the 

 herring and the mackerel and in some cases, as stated by Prof. 

 Rob. Collett, forms almost the exclusive nourishment of one of 

 our great whales, Balcenoptera horealis."^ 



Wheeler records it in Vineyard Sound near Gay Head, 

 Martha's Vineyard, on July loth, 1899, but does not mention it 

 south of that region from the Gulf Stream.- Except possibly for 

 Sharpe's account, then, the present is the first record of its occur- 

 rence in New Jersey, or so far to the south. It differs from 

 Calamis minor Claus in the shorter furcal bristles, and Calaniis 

 princeps Brady in the shorter second antennae. 



^ Crust. Norway, IV, 1903, pp. lo-ii. 



'Bull, U. S. F. Com., XIX, 1899 (1901), p. 165, fig. I. 



