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the raeral joint, edge with only a few slight and rounded crenulations. Last 

 pair of nropoda with the inner ramus simple mucroniform, and longer than 

 the basal joint of the outer, the latter with only a single spine exteriorly, 

 terminal joint very narrow, considerably exceeding half the length of the 

 basal one, and tipped by a slender spine. Lobes of telson scarcely diverging, 

 tip narrowly rounded. Colour greyish white, pellucid. Length of adult 

 female 4 mm. 



Remarks, The nearest ally of this species seems to be H. cremtlato 

 Boeck, from which however it may be easily distinguished by its perfectly smooth 

 and glabrous body, the slender antennae, the far inferior length of the penul- 

 timate pair of pereiopoda, and finally by the form and armature of the basal 

 joint of the last pair. 



Occurrence. I have met with this form in 2 different localities oft 

 the coast of Norway, viz., in the Hardangerfjord and in the Trondhjemsfjord. 

 In both localities it occurred rather sparingly in a depth of 50 to 100 fathoms, 

 muddy bottom. 



Fam. 5. Ampeliscidae. 



Body compressed, glabrous, more or less strongly curved. Cephalon 

 without any rostral projection, frontal part narrowly truncated. Anterior 

 pairs of coxal plates of moderate size and setous on the distal edge; 1st pair 

 more or less expanded distally ; 4th pair the largest and emarginated posteriorly 

 in its upper part, the emargination being bounded beneath by a projecting 

 angle; the 3 posterior pairs comparatively small. Metasome powerfully 

 developed, with large epimeral plates. Urosome short and stout with the 2 

 outer segments coalesced. Eyes, when present, simple, exhibiting, as a rule, 

 on each side near the front, 2 widely distant corneal lenses, each having 

 inside an irregular patch of pigment. Antennae very slender and setous, the 

 superior ones, originating from the tip of the cephalon, generally shorter than 

 the inferior, and without any accessory appendage, the inferior ones affixed 

 by a short and thick basal part to the lower side of the cephalon at some 

 distance from the superior. Antennae in male still more elongated and slender, 

 with rows of short fascicles of sensitive hairs clothing the opposite edges of 

 the peduncles, iiagella extremely slender, filiform and nearly naked. Anterior 

 lip short and thick, helmet-shaped; posterior lip quadrilobate, the outer lobes 

 the larger. Mandibles rather strong, with the masticatory part well-developed, 

 cutting edge on each mandible composed of 2 superposed dentated lamellae, 



