112 



as long, posterior incision narrow and not extending to the middle, terminal 

 lobes obtusely truncated at the tip, each with a small apical denticle. Co- 

 lour pale yellowish with a faint reddish tinge on the anterior division of 

 the body. Length of adult female 13 mm. 



Remarks. - Owing to a certain resemblance in its outer habitus and 

 especially in the structure of the posterior pereiopoda to OYiesivn/us plautus (Ivroyer) 

 this form was confounded with the latter by Sp. Bate, and even Boeck, in 

 determining the specimens of both forms preserved in our University Museum, 

 has fallen into considerable error, some of the specimens having been labelled 

 bv him as Oncxinni* />f/itns, whereas specimens of the latter form were vice- 

 versa determined as Menigrates dbtusifrons. On a closer examination the 

 present form may, however, easily be destinguished from Onesimus plant'u*, 

 not only by its much more tumid body, but also by the considerably coarser 

 structure of the antennae and by the very different form of the anterior gna- 

 thopoda. 



Occurrence. - I have myself only met with this form in 2 localities 

 within the Arctic region of Norway, viz., at Bodo and in Lofoten at depths 

 varying from 20 to 50 fathoms. Prof. Lilljeborg found it, however, at Grip 

 outside Christiansund on the West coast of Norway, and Boeck has stated its 

 occurrence also oft the South coast at Mandal. Finally, Mr. Schneider has 

 observed it in the neighbourhood of Tromso. None of these authors, however, 

 would seem to have observed this form in its fully adult state. 



Distribution. British Isles (Sp. Bate). 



Gen. 29. Lepidepecreum, Sp. Bate, 1868. 



Body short and stout, with the back carinated and the integuments 

 very firm, calcareous. Coxal plates large and deep. Superior antennae with 

 the joints of the peduncle partly produced anteriorly, accessory appendage 

 very small or <prite wanting; in male without any calceolse but provided 

 with dense tufts of sensitive bristles. Inferior antennae in female scarcely 

 as long as the superior and much more slender, with the antepenultimate 

 peduncular joint rather produced; in male very elongate, exceeding the length 

 of the body, rlagellum very slender, filiform and provided with distinct cal- 

 ceolae. Epistome forming a broad compressed plate projecting in front of the 

 anterior lip. Mandibles of moderate size, cutting edge simple, molar expan- 



