345 



each side a much smaller tuberculiform prominence. Cephalon somewhat 

 flattened above, and produced in front to a very large, horizontally-projected 

 rostrum, slightly hollowed dorsally and obtuse at the tip; lateral corners 

 nearly rectangular. Anterior pairs of coxal plates more than twice as deep as 

 the body ; 1st pair partly covering the sides of the cephalon, and extending in 

 front nearly to the lateral corners ot the latter, thus completely concealing the 

 buccal area, their outer part slightly expanded, with the distal edge evenly 

 curved; the 2 succeeding pairs oblong quadrangular in form; 4th pair produced 

 below the posterior emargination to an acute projection; 5th pair scarcely 

 half as deep as the former and, like the succeeding pair, having the posterior 

 lobe biangular. Last pair of epimeral plates of metasome acutely produced at 

 the lateral corners. Eyes rather small, rounded oval in form, and somewhat pro- 

 minent, pigment dark red. Superior antennae scarcely exceeding 1 /s of the length 

 of the body, 1st joint of the peduncle about the length of the other 2 combined, 

 flagellum scarcely 3 times as long as the peduncle, and composed of 30 40 

 articulations. Inferior antennse considerably shorter than the superior, the 

 2 last joints of the peduncle nearly equal-sized, flagellum about the length 

 of the peduncle. Anterior gnathopoda with the propodos much longer than 

 the 3 preceding joints combined, and oblong oval in form, palm a little longer 

 than the hind margin, which has 3 transverse rows of spines, carpal lobe 

 rather small. Posterior gnathopoda somewhat more powerful than the anterior 

 ones, propodos considerably more dilated in its proximal part, and having the 

 palm comparatively shorter, carpal lobe more projecting. Pereiopoda nearly 

 of equal length, basal joint of the 3 posterior pairs oblong quadrangular in 

 form. Last pair of uropoda not very much elongated, outer ramus exceeding 

 half the length of the inner. Telson constricted at the base, outer part broadly 

 rounded, unarmed, upper face with a triangular prominence near the base. 

 Colour very variable, now very dark, nearly black, now whitish or variegated 

 with irregular brownish shadings. Length of adult female reaching 18 mm. 



HemarJcs. This characteristic form was first described by Kroyer 

 as Ampliithoe panopla, and subsequently referred by Bruzelius to his genus 

 ParamplutJioe. It is nearly allied to P. tuber cnlat us of Sp. Bate, but differs 

 in the far less strongly tuberculated body, and, according to the drawing 

 given by that author, also in the form of the rostrum. It may be regarded 

 as the type of the present genus. 



Occurrence. - - In the arctic region of Norway this form is everywhere 

 frequently met with in moderate depths, 10 30 fathoms, among algae. It 

 extends southwards along the Nordland coast to the Trondhjemsfjord, and is 

 also occasionally met with off the west coast of Norway, as far south as 

 Bergen, but has not yet been recorded from the south coast. 



