151 



the .superior aud stroiig-ly curved, penultimate joint of the peduncle exhibiting 

 at tlie end anteriorly a transverse row of slender spines and forming posteriorly 

 a rounded exjjansion beset with strong plunmse setae and a number of curved 

 spines. Antennae in male witli the peduncles bearing dense tufts of sensory 

 liairs, 1st joint of the tlagellum of the superior ones very large and densely 

 hairy on the inferior edge, tlagellum of the inferior ones not at all differing 

 from that in female, calceolae quite wanting in l)oth pairs. Mandibles with 

 the masticatory part very short, molar exjmnsion extremely small and tipped 

 by 3 slender spines, palp rather narrow and nearly naked except at tlie 

 obli([uely truncated tip. First pair of maxillsp witli the palp distinctly bi- 

 articulate ; 2nd pair with the lobes subequal. Maxillipeds about as in the 

 preceding genera, biit with the dactylus considerably smaller. Gnatliopoda' 

 nearly e([ual-.sized, or tlie posterior ones slightly lai'ger, hands in botli ])airs 

 oval, witli the palmar edge more or less oblique. Antepenultimate pair of 

 pereiopoda with the basal joint linear and not at all expanded; penultimate 

 ])air more or less elongated; last pair comparatively small, with the basal 

 joint laminar. Last pair of uropoda in female rather short, outer ramus larger 

 than the inner and spinous ; those in male much more elongated, with both 

 rami knife-shaped and, as a rule, cpiite naked. Lobes of telson very short 

 and rounded. 



Eemarl-ti. — This genus, established by Boeck, is cliieHj' distinguished 

 by the pal]) of the 1st pair of maxillae being distinctly biarticulate, and by 

 the narrow linear form of the basal joint of the antepenultimate pair of 

 pereiopoda. The plumose character of most of the setae clothing the .antennae 

 and legs, as also the distal edge of the coxal plates, affords another easily 

 recognizable characteristic. Finallj', the sexual differences are quite peculiar. 

 The genus is abundantly represented in tlie northern seas, comprising, as it does, 

 no less than 10 species, to be described in the sequel. Of exotic species only 

 a single form has been described by the Rev. Mr. Stebbing from the Challen- 

 ger Expedition, viz., H. ohfiisifrmis, and another species, H. enmrafa, is recorded 

 by Dr. Chevreux from the bay of (irascogne (Expedition of Hirondelle). 



4. Harpinia plumosa, (Kroyer). 



(PI. 62). 



Phoxus plumusits, Kroyer, Nat. Tidsskr. ) R. Bil. IV, p. lo2. 



Syn : Phoxus fusifoniiis, Stimpson. 



Body moderately compressed and quite glabrous above, with evenly 

 vaulted back. Ceplialon somewhat exceeding in length the 3 anterior seg- 

 ments of mesosome combined, hood but slightly projecting beyond the peduncle 



