162 



the meral joint, edge witli only a few sliglit and rounded ei-enulationf;. Last 

 pair of m-opoda with tlie inner ramus simple mueroniform, and longer than 

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

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

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

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

 female 4 mm. 



Remarhs. — The nearest ally of this species seems to be H. creimJata 

 Boeck, from which however it may be easily distinguished by its perfectly smof»th 

 and glabrous bodj', the slender antennae, the far inferior lengtii 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 ofi 

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

 Li both localities it occurred rather siiaringly in a depth of 50 to 100 fathoms, 

 muddy bottom. 



Fam. 5. Ampeliscidae. 



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

 withoiit an}^ rostral projection, frontal part narrowly truncated. Anterior 

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

 moi-e or less expanded distally ; 4th ])&\v 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 slnni and stout with the 2 

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

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

 inside an irregular patch of pigment. Antenna very slender and setoiis, 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 superioi'. Antennse in male still more elongated and slender, 

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

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

 lip short and thick, helmet-shaped ; posterior lip (^uadrilobate, the outer lobes 

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

 cutting edge on each mandible composed of 2 su])erposed dentated lamellse, 



