437 



the carpus slightly widening distally, and carrying several fascicles of slender 

 bristles inferiorly, propodos about the length of the carpus, and oblong in 

 form, palm nearly transverse, and much shorter than the hind margin, from 

 which it is defined by an obtuse angle, armed with several small spines, 

 dactylus comparatively short Posterior gnathopoda somewhat more elongated 

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

 moderate length, and densely edged with fascicles of slender spinules, basal 

 joint of last pair considerably larger than that of the 2 preceding pairs, and 

 oval in form, with the posterior edge smooth, and the infero-posteal corner 

 narrowly rounded; dactylus in all pairs rather short. Last pair of uropoda 

 comparatively large, with the basal part somewhat elongated, and edged 

 interiorly with small spinules, rami about twice as long as the basal part 

 and densely edged with small spinules having between them slender bristles. 

 Telson extending nearly to the end of the basal part of the last pair of 

 uropoda, and oblong in form, about twice as long as it is broad at the base, 

 and gradually tapering distally, tip transversely truncated, or very slightly 

 emarginated. Body pellucid, with a faint yellowish tinge, and having across 

 each of the segments a transverse band of a beautiful orange pigment, 

 antennae and legs partly banded with the same pigment. Length of adult 

 female reaching 19 mm. 



EemarJcs. This form was first described by my late father as 

 Ampliiflioe fiilvocinfa, and was subsequently referred by Goes to the genus 

 Parampliithoe. Boeck regarded it as the type of his genus Halirages. The 

 Pherusa tricnspis of Stimpson is undoubtedly, as first pointed out b}^ Goes, 

 identical with tbe present species. From the very nearly related form, H. 

 quadrispinosus, described by the author from the Norwegian North Atlantic 

 Expedition, the present species is easily distinguishable by the presence of 

 only 3 dorsal projections, as also by the rather different form of the last 

 pair of epimeral plates of metasome, and of the telson. 



Occurrence. Along the whole west and north coasts of Norway, 

 this form is rather frequently met with, in moderate depths ranging from 

 10 to 50 fathoms. Especially off the Finmark coast it often occurs in great 

 abundance in the Laminarian region, among algae and Hydroida. 



Distribution. - Arctic Ocean, widely distributed: Greenland (Hansen), 

 Arctic America (Miers), Labrador (S. Smith), Spitsbergen (Goes), the Murman 

 coast (Jarzynsky), the Kara Sea (Hansen), the Siberian Polar Sea (Stuxberg). 



i>7 Crustacea. 



