122 



Occurrence. The only place, where I have met with this form, is at 

 Korshavn, south coast of Norway. It occurred here occasionally on a sandy 

 bottom, at a depth of about 40 fathoms. 



. Bay of Naples (Giesbrecht). 



Gen. 30. AretOpOntiUS, G-. 0: Sars, n. 



Generic Characters. Anterior division of body greatly expanded, with 

 the cephalic segment exceedingly large and prominent at the postero-lateral cor- 

 ners; epimeral lappets of the 3 succeeding segments well developed and produced 

 laterally. Tail comparatively short, with the genital segment unusually broad, 

 being expanded on each side in a somewhat similar manner to that in the trunk- 

 segments. Anterior antenme comparatively short, 8-articulate (in female). 

 Posterior antenna very small, but of the usual structure. Siphon resembling in 

 structure that in Dyxyontln*, but less produced. Maxillae with the lobes rather 

 unequal in size. Both pairs of maxillipeds, but especially the anterior ones, 

 very strongly built. 1st pair of natatory legs with the terminal joint of the 

 outer ramus carrying inside 3 setce and outside only 2 spines; 4th pair with the 

 outer ramus normally developed, inner very small, biarticulate. Last pair of 

 legs still more rudimentary than in the 2 preceding genera. 



Remarks. This new genus differs from the 2 preceding ones in the very 

 broad and flattened form of the body, the comparatively short antennae, the very 

 powerfully developed maxillipeds, and, finally in the presence on the 4th pair of 

 legs of a distinct, though rather imperfectly developed inner ramus. It com- 

 prises as yet only a single species, to be described below. 



68. Arctopontius expansus, G. 0. Sars, n. sp. 



(PI. LXXII). 



Specific Characters. Female. Body very broad and pronouncedly depressed, 

 with the anterior division almost as broad as it is long. Cephalic segment occu- 

 pying more than half the total length, postero-lateral corners considerably pro- 

 jecting, free edges evenly curved, front narrowly rounded, without any dorsal 

 crest; rostrum of the usual short linguiform-shape. Epimeral lappets of the 3 

 succeeding segments rather produced; those of penultimate segment resembling 

 in shape the preceding ones, though somewhat smaller. Tail scarcely exceeding 



