4;; 



acuminate. Coxal plates very large and close together, the inferior edges of 

 the 4 anterior pairs forming on each side an uninterrupted arch, 4th pair tin- 

 largest and nearly three times as deep as the body, deeply emarginated po- 

 steriorly, the lower part considerably dilated and forming posteriorly a sharp 

 corner; 5th pair about as dee]) as broad. Last pair of epimeral plates of 

 metasome produced at the posterior coner to a sharp upturned liooklikc pro- 

 jection. Eyes large, broadly reniform, pigment dark purplish. Superior 

 antennae almost the length of the cephalon and the 2 anterior segments of 

 the mesosome combined, 1st joint of peduncle rather broad, with a row of small 

 delicately ciliated bristles on the posterior edge, the 2 succeeding joints con- 

 siderably narrower and combined about as long as the 1st; flagellum slender, 

 about the length of the peduncle, 12-articulate; accessory appendage very 

 small, triarticulate. Inferior antennae in female scarcely longer than the superior, 

 3rd joint of the peduncle unusually large, flagellum shorter than the peduncle ; 

 in male greatly elongated, exceeding the length of the body, flagellum yerv 

 narrow, filiform. Anterior gnathopoda unusually short, basal joint as long as 

 the whole remainder part of the leg, propodos narrow, tapering, a little longer 

 than the carpus. Pereiopoda densely setous, the setae in female simple, in 

 male plumose, carpal and propodal joint, as well as the dactylus, in all very 

 slender. Last pair of uropoda with the rami scarcely as long as the basal 

 part. Telson oval, unarmed, evenly rounded posteriorly. Colour pale 

 yellowish, with irregular orange shades on the 4 posterior pairs of coxal 

 plates and the posterior segments of the body. Length 12 mm. 



Remarks. It appears to me somewhat doubtful whether the present 

 form is identical with the species so named by Milne Edwards. But as Sp. 

 Bate has identified the British form, which unquestionably is the same as 

 that here described, with Milne Edwards' species, I think the name proposed by 

 the latter author must be retained for the present form. 



Occurrence. - The species would seem to have a similar distribution 

 on the coast of Norway as Iclmopus spiniconn*. having been met with only 

 o the west coast: at Christiansund, Sognefjord, Bukken, Mosterhavn, Hauge- 

 sund. It occurs in rather deep water, from 50 to 100 fathoms. 



British Islands, France, Mediterranean. 



(leu. K Socames, Boeck, 1870. 



Body less compressed, with rather large coxal plates. Antennae aboul 

 as in Lysianassa, saving that the accessory appendage of the superior ones 

 is more developed. Oral parts very like those in the said genus, 1ml the 



