182 BRITISH ENTOMOSTRACA. 



four long, simple setai ; the third is the shortest of all, 

 with a projection on its under edge, which gives off two 

 stout, plumose seta3 ; 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 h) are large, and like 

 those of preceding species, except that the long filaments 

 are distinctly and beautifully plumose, and that there was 

 apparently no ai)pendage attached to the basilar joint. The 

 first (f. 1 (j) 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. 



Ilab. — Dredged in from eighty to ninety fathoms sand, 

 twenty miles east of the Noss in the Shetland Isles, 

 R. M'Andiew, Esq. 



Ordee II— COPEPODA.* 



Cakcinoida {pars),Latreille, Cuv. Regnc An., iv, 151. 

 CoPEPODES, M. Edwards, Hist. Nat. Crust., iii, 411. 

 CoPEi'ODA, Baird, Traus. Berw. Nat. Club, ii, 1845. 

 Cropuykopoda a, BurmeMer, Orgaiik. of Trilob. (Ray Soc. edit.), 34. 

 CiiusTACEA 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. Feet five 

 pairs in number, mostly adapted for swimming. Ovary 

 external. 



* From KWTTij, oar ; and ifovc^ foot. 



