570 



mesosome combined, lateral corners not much produced, but angular at the 

 tip, with the lower edge gently curved. Anterior pairs of coxal plates nearly 

 twice as deep as the corresponding segments, and densely setiferous on the 

 distal edge; 1st pair somewhat attenuated distally and obliquely rounded at 

 the tip; the 2 succeeding pairs oblong quadrangular in form; 5th pair with 

 the anterior lobe very large and obliquely rounded at the tip. Last pair of 

 epimeral plates of metasome rounded at the lateral corners. Eyes small, 

 rounded, placed at some distance from the tip of the lateral corners of the 

 cephalon. Antennae rather strongly built, and provided along their posterior 

 edge with numerous fascicles of slender bristles ; the superior ones about half 

 the length of the body, 2nd joint of the peduncle the longest, 3rd joint 

 somewhat longer than the 1st, flagellum but little exceeding half the length 

 of the peduncle, and composed of about 9 articulations. Inferior antennas 

 a little shorter than the superior, with the flagellum about the length of the 

 last 2 peduncular joints combined. Anterior gnathopoda in female rather 

 robust, with the carpus expanded below to a broad setiferous lobe, propodos 

 somewhat exceeding the carpus in length, and rather broad, oval quadrangular 

 iji form, with the palm nearly transverse and denned below by an obtuse 

 angle, dactylus strong and minutely denticulated inside. Posterior gnathopoda 

 somewhat more strongly built than the anterior, but otherwise of a very 

 similar structure, carpal lobe very narrow, propodos large and broad, with 

 the palm somewhat flexuous, and denned below by a distinctly projecting 

 angle armed with a slender spine. Gnathopoda in male considerably stronger 

 than in female, with the propodos comparatively larger, palm in the anterior 

 ones slightly excavated, in the posterior ones much shorter than the hind 

 margin and defined below by a strong acuminate projection, its edge, bi-sinuate, 

 with a narrowly rounded lobe in the middle, dactylus in both pairs, but 

 especially in the posterior one, very strong. Pereiopoda comparatively rather 

 stout; antepenultimate pair with the propodal joint somewhat expanded in its 

 outer part, forming a kind of palm armed with a slender spine, against which 

 the short and stout dactylus impinges, when closed; the last 2 pairs of 

 nearly equal length, with the basal joint oblong oval in form. Last pair of 

 uropoda with the outer ramus scarcely longer than the basal part, terminal 

 joint tipped by a strong spine. Telson not twice as broad as it is long, 

 uter part tapering, and having on either side of the tip a small nodiform 

 projection. Body greyish white, variegated with a light brown pigment, 

 forming more or less distinct bands across the segments and coxal plates. 

 Length of adult female 5 mm, of male about the same. 



Remarks. This form was first described by Kroyer from Green- 

 land specimens, and may be regarded as the type of the present genus. The 



