182 
BRITISH ENTOMOSTRACA. 
four long, simple setae ; the third is the shortest of all, 
with a projection on its under edge, which gives off two 
stout, plumose setae ; the fourth, longer and narrower than 
the preceding, is armed on its outer edge with five simple 
setae ; and the fifth is very slender, and terminated by 
four short, simple spines. 
The natatory feet (t. XXIII, f. 1 b) are large, and like 
those of preceding species, except that the long filaments 
are distinctly and beautifully plumose, and that there was 
apparently no appendage attached to the basilar joint. The 
first (f. 1 g) and second pairs (f. 1 d) of jaws are of the 
same structure as in C. Mac Andrei. The oviferous feet 
(f. 1 /) are stronger than in the preceding species, and 
are armed with a much greater number of spines, being 
not less than twenty-four. The caudal plate is exactly 
the same as described in Mac Andrei. 
Hab . — Dredged in from eighty to ninety fathoms sand, 
twenty miles east of the Noss in the Shetland Isles, 
R. M c Andrew, Esq. 
Order II— COPEPODA * 
Carcinoida {pars), Latreitte, Cuv. Regne An., iv, 151. 
Copepodes, M. Edwards, Hist. Nat. Crust., iii, 411. 
Copepoda, Baird, Trans. Berw. Nat. Club, ii, 1845. 
Crophyropoda A, Burmeister, Organiz. of Trilob. (Ray Soc. edit.), 34. 
Crustacea copepoda (cyclopacea), Dana, Proc. Amer. Acad. Arts and 
Sciences, 1847. 
Character . — Body divided into several very distinct 
rings. Envelope consisting of a buckler, inclosing head 
and thorax. Mouth possessed of foot-jaws. Eeet five 
pairs in number, mostly adapted for swimming. Ovary 
external. 
* Prom k( 07 tt], oar ; and tcovq, foot. 
