134 Messrs. Brady a/irf Robertson on Marine 



3. Harpacticus Jiexusy ii. sp. PL IX. figs. 17-21. 



Anterior antennte rather short and stout, eight-jointed, first 

 four joints in the female of nearly equal length, last four also 

 subequal and less than one half the length of the preceding ; 

 anterior antennse of the male short and stout, joints coalescent, 

 so as to form four only, terminating in a large vesiculiform 

 swelling : second antennas having a minute biarticulate 

 branch. Posterior maxilliped small ; hand elongated, oval, with 

 a slender, gently curved terminal claw. First pair of feet not 

 materially different from those of H. chelifer^ but more slender ; 

 fifth pair of feet in both sexes broader than in H. chelifer ; 

 third pair of feet in the male, as in all other species of this 

 genus, largely developed and armed with very strong spines. 

 Body suddenly bent forward at the junction of thorax and 

 abdomen. Length Vo of an inch. 



Taken in the surface-net in Westport Bay ; moderately 

 plentiful. 



We at first thought this might perhaps be a young form of 

 some better-known species ; but the uniform size of the speci- 

 mens, the different proportions of the antennal joints, and the 

 form of the posterior maxilliped point it out as entitled to 

 distinct specific rank. 



Genus Zaus, Goodsir. 

 Zaus spmosus, Goodsii'. 

 On weeds in Ventry Bay : dredged by Mr. E. C. Davison. 



1. Alteutha ohlonga (Goodsir). 

 Carillus ohlmgus ( 2 ), Goodsir, Ann. & Mag. Nat. Hist. vol. x^-i. (1845), 



pi. xi. figs. 12-15. 

 ? Sterope {nterniptus (S), Goodsir, loc. cit. pi. xi. fig. 10. 

 Alteutha bopyroides, Claus, Die frei-lebend. Copepod. p. 143, Taf. xxii. 



figs. 10-17. 



Taken commonly all round the British Islands in the open 

 sea. Both males and females occur in surface-gatherings ; but 

 females with ova we have only rarely foimd, and those always 

 in dredgings from several fathoms depth. 



2. AlteutJia purpurocincta^ Noi-man. 

 On the fronds of Laminaria saccharina in Clifden Bay. 



Aspidiscus fasciatus, Norman. 

 On Laminaricf: in Clifden and Ventry Bays. 



