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 Cyclops clielifer of Muller, 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 c 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. clielifer to be identified with it. In describing this 
species, Muller says there are no articulations in the body, 
but that in form it is “ farciminis facie/’* He figures, 
too, only three articulations to the antennse. 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 occurrence, 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 setae ; 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 Cyclops chelifer of 
Muller. 
Hab. — Sea-shore of Berwickshire, Cockburnspath, Ber- 
wick Bay, &c. ; common. Hover, North Foreland, Sep- 
tember 1849 . v, 
2. Arpacticus nobilis. Tab. XXVIII, figs. 2, 2 a-e. 
Arpacticus nobilis, Baird, Trans. Berw. Nat. Club, ii, 155, 1845 ; 
Ann. and Mag. Nat. Hist., xvii, 416, t. 9, 
f. 5, 5 a , b, c, d. 
The thoracic and abdominal portions of the body are 
* TilesiuS describes his C. armatus as having the articulations of the body 
very indistinct, and uses the same expression, “farciminis facie/’ He alludes 
to the C. chelifer of Muller as being a fresh-water species ! 
