82 



gularly produced posteriorly; 5th pair not very large, much more broad than 

 deep. Last pair of epimeral plates of metasome with the posterior lobe sharply 

 pointed. First segment of urosome without any dorsal projection. Eyes of 

 moderate size, oval, pigment light red. Superior antennae in female about the 

 length of the cephalon and the 3 first segments of mesosome combined; peduncle 

 not very tumeficated; flagellum more than twice its length and composed of 

 about 18 articulations, the 1st of which is very large ; accessory appendage 

 scarcely x /4 as long as the flagellum and 5-articulate. Same antennae in male 

 nearly twice as long, flagellum very slender and composed of about 30 arti- 

 culations. Inferior antennae in female scarcely as long as the superior, flagel- 

 lum 15-articulate ; in male very elongated, exceeding the length of the whole 

 body, peduncular joints rather dilated, flagellum extremely slender, filiform. 

 Epistomal spine considerably projecting beyond the edge of the anterior coxal 

 plates. Anterior gnathopoda slender and feeble in structure, propodos much 

 shorter than the carpus and nearly of uniform breadth throughout, palmar 

 edge somewhat oblique. Posterior gnathopoda with the propodos a little short- 

 er than the carpus, oblong oval, or nearly fusiform, superior edge straight, 

 inferior one bulging out at the middle. Anterior pereiopoda densely setous 

 on the posterior edge ; the 3 posterior pairs, but especially the 2 last ones, 

 extremely slender and elongate, with the propodal joint very narrow, and the 

 dactylus straight and setiform. Last pair of uropoda with the inner ramus 

 longer than the basal joint of the outer, terminal joint of the latter spiniform; 

 penultimate pair with the inner ramus deeply incised near the tip and bear- 

 ing immediately above the incision a slender spine. Telson. oblong, only slightly 

 tapering distally, with 3 pairs of dorsal denticles, the middle one rather elon- 

 gated, cleft extending far beyond the middle and gradually widening poster- 

 iorly, apical denticles of each terminal lobe diminishing in length inwards. 

 Body whitish pellucid, with reddish brown intestine ; ova in the marsupial 

 pouch orange-coloured. Length of adult female 12 mm; of male about 

 the same. 



Remarks. This is the only as yet known species of the genus; for 

 none of the earlier described forms of Lysianassidae can properly be referred 

 to it, at least so far as our present knowledge of them goes. 



Occurrence. - - Off the coast of Norway this is one of the commonest 

 Lysianassidae, often occurring in considerable numbers at depths varying from 

 20 to 100 fathoms. I have met with it in numerous places both on the south 

 and west coast, as also along the whole coasts of Nordland and Finmark up 

 to the Varangerfjord. 



Distribution. - -Denmark, British Isles, west coast of France (Chevreux) ; 

 Mediterranem (found bytte author at Naples). 



