550 



Boeck is only founded upon adult males of the present species. From 

 A. Websteri it may be easily distinguished by its more slender form of body, 

 the smaller accessory appendage of the superior antennae, and the structure 

 of the gnathopoda in the two sexes. Moreover the superior antennae, as also 

 the last pair of pereiopoda, are comparatively more elongated, and the colour 

 of the body rather different. 



Occurrence. This species is met with much more frequently than 

 the preceding one, and occurs along the whole south and west coasts of 

 Norway, at least to the Trondhjemsfjord, in depths varying from 10 to 50 

 fathoms, muddy bottom. 



Distribution. Bohuslan (Bruzelius), Kattegat (Meinert), the Kara 

 Sea (Hansen). 



7. Autonoe megacheir, Gr. 0. Sars. 



(PI. 195, fig. 2). 

 Autonoe megacheir, G. O. Sars, Crust. & Pycnog. nova Exped. Norv. No. 35. 



Body rather slender, and somewhat resembling in form that of 

 A. longipes. Cephalon nearly as long as the first 2 segments of mesosome 

 combined, lateral corners, as usual, obliquely rounded. First pair of coxal 

 plates in female somewhat angular, in male produced anteriorly to a rather 

 long acuminate projection. Last pair of epimeral plates of metasome some- 

 what more produced at the lateral corners than in the other species, and 

 nearly rectangular. Eyes wanting, being replaced on each side by a small 

 patch of whitish pigment, without any trace of visual elements. Superior 

 antennae very slender and elongated, nearly attaining the length of the whole 

 body, 2nd joint of the peduncle, as usual, considerably longer and narrower 

 tli an the 1st, flagellum nearly twice the length of the peduncle, and composed 

 of about 20 articulations, accessory appendage longer than the last peduncular 

 joint, and 4-articulate. Inferior antennae scarcely more than half the length 

 of the superior, and of the usual structure. Anterior gnathopoda in female 

 rather strong, with the propodos oblong oval in form, and about the length 

 of the 2 preceding joints combined, dactylus of moderate size, and quite 

 smooth. Posterior gnathopoda much smaller, and resembling those in 

 A. longipes. Anterior gnathopoda in male very powerfully developed, basal 

 joint moderately expanded, and having at the infero-posteal corner a dense 

 tuft of comparatively short bristles, the 3 succeeding joints densely setous 

 only along their lower side, propodos but slightly setous, but rather large 



