28 



Antemue somwhat more robust, but otherwise rather similar. Gmathopoda of 

 female having the propodos comparatively larger, much longer than the 2 

 preceding joints combined, oblong oval in form, with the palm very oblique 

 and less distinctly defined below ; 2nd pair in male with the propodos oblong 

 in form, distinctly tapering toward the tip. Pereiopoda very robust, edged 

 with scattered small spines, propodal joint, especially of the 3 posterior pairs, 

 considerably dilated and armed on the anterior edge below the middle with 

 2 unusually strong serrated spines, dactylus very powerful, falciform curvate. 

 Colour yellowish. Length of female 7 mm. 



Eemarl*. This is evidently a well marked species, differing very 

 decidedly from the typical form by the peculiar imbricated appearance of the 

 body-segments and especially by the rather different structure of the legs. 

 The colour also is rather dissimilar. 



Occurrence. - 1 have myself only met with a single female specimen 

 of this species, which was taken on the west coast of Norway. In our Uni 

 versity Museum are, however, 2 specimens, male and female, collected by 

 Boeck, the one on the shores of Karmo, the other at Farsund (south coast of 

 Norway). According to the Rev. Mr. Stebbing, this species is far less active 

 tli an H. XUxxnni, quite wanting the power of leaping, when out of water. 



Distribution. British Islands, France, coast of Algiers (Chevrenx). 



Fam. 2. Lysianassidae. 



Body generally rather high, more or less compressed, glabrous, with 

 the back evenly vaulted. Coxal plates deep, 4th pair generally the largest 

 and deeply emarginated posteriorly to receive the rounded 5th pair. Meta- 

 some well developed, witli large epimeral plates. Urosome short and thick, 

 more or less convex above. Superior antennae furnished with an accessory 

 appendage, peduncle short and thick, flagellum more or less elongated, with 

 the 1st joint generally rather large ond beset with dense tufts of sensitive 

 hairs. Inferior antenna? more slender than the superior and having the basal 

 joints not coalesced with the cephalon, fiagellum in male often greatly elongated 

 and filiform. Epistomc generally projecting in front of the anterior lip; the 

 latter more or less produced anteriorly. Mandibles less strong than in 

 the Orchestiidse, cutting edge simple, not denticulated, molar expan- 

 sion rather small or quite wanting, palp large, triarticulate; between 

 the latter and the cutting edge a more or less distinct rounded ac- 

 cessory lobe. First pair of maxilla 1 with the palp generally well devel- 



