214 BRITISH ENTOMOSTRACA. 



broad, flat body, rounded at one side, and furnished with 

 several rather long, finely-serrated setae. 



The specimens of this species, which I have now referred 

 to the Cj/dojjs chelifer of Midler, differ in so many points 

 from his figures and description, that in a paper upon the 

 Berwickshire Entomostraca, read before the Berwick. Nat. 

 Club, and since that published in their ' Transactions,' 

 I was induced to make a distinct species of it, and named 

 it Cyclops Johnstoni. Upon more minute examination, 

 however, I have become satisfied that, notwithstanding 

 these discrepancies, it approaches sufficiently near the 

 C. chelifer to be identified with it. In describing this 

 species, Miiller says there are no articulations in the body, 

 but that in form it is " farciminis facie."* He figures, 

 too, only three articulations to the antennae. These charac- 

 ters are so much at variance with the analogous portions 

 of the body in all the other species of this family, that, as 

 he mentions it as of rare occm-rence, it is most probable 

 he must have made some mistake with regard to them. 

 Some differences also exist in his description of the first 

 pair of feet, and the length of the caudal setai ; but they 

 agree so well in the characteristic foot-jaws, in the beaked 

 head, and in the general form of the animal, that I have 

 now no hesitation in referring it to the Ci/clops chelifer of 

 Miiller. 



Hab. — Sea-shore of Berwickshire, Cockburnspath, Ber- 

 wick Bay, &c. ; common. Dover, North Foreland, Sep- 

 tember 1849. 



2. Arpacticus nobilis. Tab. XXVIII, figs. 2, 2 a-e. 



Arpacticus nobilis, Ba'ird, Trans. Berw. Nat. Club, ii, 155, 1845 ; 

 Ann. and Mag. Nat. Hist., xvii, 416, t. 9, 

 f. 5, 5 a, h, c, d. 



The thoracic and abdominal portions of the body are 



* Tilesius describes his C. urmatus as having the articulations of the body 

 very indistinct, and uses the same expression, "farciminis facie." He alludes 

 to the C. chelifer of MiiUer as being a fresh-water species ! 



