680 



others, and produced below the posterior eraargination to an acute projection. 

 Last pair of epimeral plates of inetasoine having the posterior projection tnni- 

 snally short and broad, triangular in form, and not defined from the posterior 

 edge by any incision. First segment of nrosome with a slight saddle-like depres- 

 sion dorsally, but without any distinct projection. Integiiments very finely 

 and irregularly reticulated. Eyes narrow oblong in form, slightly widening 

 below, without any trace of visual elements, pigment light red with a few 

 opaque white stripes transversally. Superior antennae with the first 2 joints 

 of the peduncle somewhat ])roduced anterioidy, flagellum in female nearly 

 twice the length of the peduncle, and composed of about 11 articulations, the 

 1st of which is half as long as the remaining part of the flagelhim ; accessory 

 appendage very slender and 4-articulate. Inferior antennae in female nearly 

 3 times as long as the superior and very slender, last joint of the peduncle 

 but little longer than the penultimate one. flagellum more than twice as long 

 as the peduncle, and composed of about 32 articulations. Gnathopoda, pereio- 

 poda and uropoda scarcely differing from those parts in the other species. 

 Telson about twice as long as it is broad at the base, and gradually tapering 

 distally, with 2 or 3 pairs of subdorsal denticles, cleft very narrow and extend- 

 ing beyond the middle, terminal lobes obtusely acuminate, each with a small 

 apical denticle. Body whitisii, pellucid, without any orange or crimson 

 patches, but having the coxal plates and basal joints of the 3 posterior pairs 

 of pereiopoda mottled with small, dark greenish spots ; ova in the marsupial 

 pouch of a rosy colour. Length of adult female 10 mm. 



Bemarks. — Though nearly allied to the 3 species described in this 

 work, the present new species may be readily distinguished from any of tliera 

 by its more robust form of body, and especially by the unusually short and 

 broad posterior projection of the last pair of epimeral plates of the metasome 

 In a living state, it is also at once distinguished from the 2 other Norwegian 

 species by the absence of the crimson pigment adorning the nrosome in both 

 those species, as also by the peculiar dark greenish spots on the coxal plates 

 and basal joints of the posterior pairs of pereiopoda. 



Occurrence. — Several specimens of this species, all of them females, 

 were collected in the Trondhjemsfjord, at Lexvigen, from a depth of about 

 50 fathoms. This is the only locality, where the species has hitherto occur- 

 red, within my experience. 



