114 G. 0. SARS. CRUSTACEA. [NORW. POL. EXP. 



Gen. Lubbockia, Glaus. 



Remarks. This genus was established in the year 1863 by Prof. Glaus, 

 to include a peculiar pelagic Copepod found at Messina, L. squillimana. 

 Another species, L. aculeata, has recently been added to this by Dr. Gies- 

 brecht, both forms having been stated by the same author to occur also in 

 the tropical parts of the oceans. North of the Mediterranean, however, neither 

 of them have ever been recorded, and the genus has therefore been supposed 

 to have quite a southern distribution. It was therefore very surprising to 

 find this genus represented in the Polar Sea by a well-marked species, closely 

 allied to one of the 2 previously known forms. 



The present genus undoubtedly belongs to the same family as Onccea, 

 though differing rather markedly, both in the presence of only a single 

 (dorsal) ovisac, and in the structure of the oral parts. The latter, as also the 

 posterior antennae, exhibit a pronounced resemblance in structure to those 

 appendages in the genus lAchomolgus, Torell, the species of which, as is 

 well known, live a parasitic life within the branchial cavity of Ascidians. 

 It is, indeed, very probable, that the species both of the present genus and 

 that of Onccea, lead a semi-parasitic existence on some pelagic animals; but 

 as yet, their hosts have not been ascertained. 



26. Lubbockia glacialis. n. sp. 

 (PL XXXIII). 



Specific Characters. ? Body very slender and elongated, with the 

 anterior division somewhat tumid and, seen dorsally, oblong oval in form, 

 somewhat more attenuated behind than in front, anterior extremity evenly 

 rounded, penultimate pedigerous segment slightly emarginated behind, with 

 the lateral corners scarcely produced. Tail exceedingly narrow and elongated, 

 rod-like, about equalling in length 2 /a of the anterior division, segments 

 smooth, without any circlets of denticles behind, genital segment slightly 

 dilated in its anterior part, anal segment scarcely more than half as long as 

 the preceding one. Caudal rami about twice the length of the anal segment, 

 and narrow linear in form, pointing straight behind, seta of the outer edge 

 occurring about in the middle. Anterior antennae 7-articulate, and clothed 

 with very long bristles, among which a number of very delicate sensory 



