329 



bottom. It also occurs rather frequently in the Trondhjemsfjord, and extends 

 northwards along the whole coast of Nordland and Finmark until Vadso, 

 though being less coramon here. 



Distrihufion. — British Isles (Sp. Bate, Norman), Kattegat (Meinert), 

 coast of France (Chevreux). 



26. Halimedon acutifrons, G. 0. Sars, n. sp. 



(PI. 116, tig. 1). 



Form of body somewhat more slender than in the type species, other- 

 wise very similar. Cephalon attaining the length of the first 4 segments of 

 mesosome combined, frontal part considerably produced, and gradually tapering 

 to a horizontally projected acute point reaching beyond the basal joint of 

 the superior antennae, upper face of the front but very little vaulted, lateral 

 corners of cephalon somewhat less produced than in H. MiUleri. First pair 

 of coxal plates very much expanded in their outer part; the 3 succeeding pairs 

 somewhat narrower than in the said species, and considerably deeper than the 

 body. Eyes oblong oval in form, placed about midway between the insertion of 

 the superior antennge and the tip of the rostrum, pigment light red. Superior 

 antennae in female scarcely attaining the length of the cephalon and the firsts seg- 

 ments of mesosome combined, 2nd joint of the peduncle very slender and consider- 

 ably longer than the 1st, flagellum shorter than the last 2 joints of the peduncle 

 combined, and composed of about 10 articulations. Inferior antennae exceeding 

 the superior by about 'A of their length, last joint of the peduncle scarcely 

 longer than the penultimate one, flagellum about as in H. Mulleri. Gnatho- 

 poda comparatively still more feeble than in that species, propodos of the 

 anterior ones more than twice as long as it is broad, and somewhat exceeding 

 in length the carpus, that of the posterior ones still narrower, equalling in 

 length the carpus, and having the palm scarcely longer than the hind margin, 

 carpal expansion in the former broader and more projecting than in the latter. 

 Pereiopoda somewhat more slender and less richly setous than in the type 

 species, propodal joint of the 2 anterior pairs less distinctly dilated, dactylus 

 in these and the 2 succeeding pairs very slender and elongated. Last pair of 

 pereiopoda very much elongated, basal joint considerably dilated in its proximal 

 part, carpal joint about the length of the propodal one, and each somewhat 

 longer than the meral joint. Last pair of nropoda nearly as in H. MiUleri. 

 Telson comparatively smaller and more narrowly rounded at the tip. Body 

 very pellucid, whitish with a faint yellowish tinge; ova in the marsupial 

 pouch rose-coloured. Length of adult female 8 mm. 



42 — Crustacea. 



