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setiform. Telson not attaining half the length of the stem of the uropoda, and 
exhibiting the usual shape and armature. Colour light fuscous. Length 4 mm. 
Remarks .—This form is nearly allied to L. ampullacea, though easily 
distinguishable by its less strongly built body, the almost globose and densely hairy 
anterior division, and the extremely slender tail. It is also much inferior in size. 
Occurrence .—I first found this form in the Christiania Fjord, at Holme- 
strand, where it occurred rather abundantly, and have subsequently met with it 
also in several other places on the Norwegian coast, as far north as Vadso. It 
is a pronounced deep-water form, only occurring in depths below 60 fathoms, on 
a muddy bottom. I have not hitherto succeeded in finding adult male specimens 
of this species either. Out of Norway, this form has not yet been recorded. 
Fam. 6. Pseudocumidae. 
Characters .—Body of various forms, sometimes very slender, sometimes 
comparatively short and clumsy. Anterior division generally well marked off from 
the posterior, and having 5 segments exposed behind the carapace; the latter of 
moderate size and without any spiniform protuberances, pseudorostral projection 
of varying form, subrostral corners generally well marked, lower edges unarmed. 
Tail slender, smooth. Eye generally well developed. Superior antennse only 
slightly different in the two sexes, inner flagellum rudimentary. Inferior antennae 
in female very small, in male well developed, resembling those in the male 
Diastylidce. Oral parts on the whole normal. The 2 anterior pairs of legs in 
female, and all but the last pair in male, provided with well-developed exopodites; 
3rd and 4th pairs in female with a small appendage (rudimentary exopodite) 
outside the basal joint. Two pairs of pleopoda present in the male, the posterior 
pair, however, very small and rudimentary. Uropoda with the inner ramus uni- 
articulate, the outer Inarticulate. Telson well defined from the last caudal seg¬ 
ment, but very small, flap-shaped. 
Remarks .—This family in some characters apparently approaches the 
Diastylidce, in others the Lampropidce, but evidently ought to be kept apart from 
all of them. With the Diastylidce it agrees among other things in the structure 
ot the inferior antennse in the male, as also in the presence of only 2 pairs of 
