180 

 12. Ampelisca amblyops, G. 0. Sars, n. sp. 



(PI. 63, fig. 1). 



Cephalon comparatively short, not attaining the length of the 3 an- 

 terior segments of mesosome combined, frontal part Irat slightly tapering and 

 deeply emarginated at tlie tip, the lower corner rather projecting. Fii'st ])air 

 of coxal ])lates obliquely expanded distally, and, as in the jireceding species, 

 not concealing the basal part of the inferior antennae; 4th pair much greater 

 in depth than in breadth, inferior and posterior edges nearly of equal length and 

 defined by an obtuse angle. Last pair of epimeral plates of metasome slightly 

 produced at the lateral corners. First segment of urosome having a rather 

 conspicuous dorsal carina terminating in a projecting corner, blunted at the 

 tip. Corneal lenses wholly wanting, but 2 irregular patches of a reddish 

 pigment present in the usual place. Antennae in female elongated and slender, 

 with fascicles of delicate bristles posteriorly, the superior ones somewhat 

 shorter than the inferior, with the 1st joint of the peduncle comparatively 

 large and stout, 2nd very slender, flagellum twice the length of the peduncle, 

 and composed of about 25 articulations. Inferior antennae not fully attaining 

 the length of the body, last joint of the peduncle longer than the penultimate 

 one. Gnathopoda comparatively slender, and of almost the same structure as 

 in A. anomula. Dactyliis of the anterior pairs of pereiopoda about the length 

 of the 2 preceding joints combined. The 2 succeeding pairs comparatively 

 elongated and slender. Last pair of pereiopoda with the basal joint considerably 

 exceeding in length the remaining part of the leg, posterior expansion obli- 

 quely truncated at the tip, ischial joint rather stout, meral joint small and 

 strongly constricted at the base, propodal joint oblong, and scarcely as long 

 as the 2 preceding joints combined, dactylus about half its length, and lan- 

 ceolate in form. Last pair of nropoda rather large, rami twice the length of 

 the basal part, and foliaceous, with a few scattered marginal bristles. Telson 

 oblong oval, with 2 pairs of dorsal denticles, and one pair of apical spinules. 

 Body liighly pellucid, and nearly colourless. Length of adult female 8 mm. 



Eemar/ifi. — This new species somewhat resembles A. anomala, from 

 which it is however at once distinguished by the absolute, want of any corneal 

 lenses. It moreover diftei's liy the antennae Ijeing somewhat sliorter, and by 

 the more produced last pair of epimeral plates of metasome. 



Occurrence. — It is a very rare species, and confined to considerable 

 depths. I have found it in two widely distant places off the coast of Norway, 

 viz., in the outer part of Christianiafjord off Hvalor, and in the Trondhj ems- 

 fjord at Vennaes. In bdtli jilaces it occurred (piite solitary in depths from 100 

 to 150 fathoms. 



Distribution. — Bohuslan (Stockholm Museum). 



