328 



longer than the 1st and very narrow, flagellum about the length of the 2 

 last joints of the peduncle combined, and composed of 10 articulations; those 

 in male more strongly built, with the flagellum considerably longer than the 

 peduncle, and composed of 14 articulations, the 10 first of which are thickened 

 and densely clothed with delicate sensory hairs. Inferior antennae in female 

 exceeding the superior by about V* of their length, last joint of the peduncle 

 longer than the penultimate one, both densely setous, flagellum not quite 

 attaining the length of those joints combined. Same antennae in male greatly 

 elongated, nearly attaining the length of the whole body, joints of the peduncle 

 nearly bare, flagellum very slender and filiform. Anterior gnathopoda rather 

 feeble, propodos scarcely longer than the carpus, and oblong oval in form, 

 palm evenly curved and nearly twice as long as the bind margin, carpal lobe 

 broadly rounded and densely setous. Posterior gnathopoda a little more 

 slender than the anterior, otherwise of much the same structure. Pereiopoda 

 densely setous, propodos of the 2 anterior pairs about the length of the carpus 

 and somewat dilated in the middle, nearly subfusiform in outline, and having 

 the outer half of the anterior edge provided with dense tufts of bristles, dac- 

 tylus about the length of the propodos. The 2 succeeding pairs successively 

 increasing in length, and of usual structure. Last pair of pereiopoda exceed- 

 ing half the length of the body, basal joint rounded oval, carpal and meral 

 joints of about equal length, propodal joint a little longer. Last pair of 

 uropoda with the rami longer than the basal part, narrowly lanceolate, and 

 edged with small spinules. Telson oval in form, tip broadly rounded off, and 

 provided with several small bristles. Body pellucid, whitish, with a more or 

 less pronounced, light reddish tinge; ova in the marsupial pouch a beautiful 

 orange-colour. Length of adult female 8 mm., of male nearly the same. 



Remarks. - The Rev. Mr. Norman has recently 1 ) stated, that no less 

 than 3 supposed species established by Sp. Bate have in fact turned out to 

 be identical with the Halimedon MiiUcri of Boeck. He applies one of the 

 specific names proposed by that author, viz., parwmanus, to the species in 

 question. But as, indeed, 3 different names were, by a wrong apprehension, 

 given by Sp. Bate to the very same species, and none of these names is par- 

 ticularly appropriate, I think it will be best to avoid them altogether and 

 restore that given to the species by Boeck. The present form may be 

 easily distinguished from the 3 succeeding species by the form of the cephalon, 

 particularly the frontal part of the latter. It is the type of the genus. 



Occurrence. -- Off the south and west coasts of Norway this form is very 

 commonly met with in moderate depths, from 20 to 50 fathoms, muddy 



') Notes on British Ainphipoda 1. Ann. & Mag. Nat. Hist. June 1889, p. 455. 



