442 



OccHtreiice. — I have myself only met with this form in a single 

 place, viz., at Rest, the outmost of the Lofoten Isles, where a few sjjecimens 

 were collected, during the Norwegian North Atlantic Expedition, from a depth 

 of 6 to 10 fathoms, sandy bottom. Boeck's deseri])tion was made from 

 a solitary specimen found off the Nordland coast. (Jut of Norway it has not 

 yet been recorded. 



5. Apherusa tridentata (Bruzel). 



(PI. 156, fig. 1). 

 Faratnphiihuc tridcntula, Bruzelius, Ampliip. Gammar. K. Vet AUad. Hamll. Ill, p. T'l, fig. 13. 



Syn. : Halirages tiideiitatus, Boeck. 



Body comparatively less slender than in the 2 preceding species, and 

 somewhat compressed; last segment of mesosome and the 2 anterior ones of 

 metasome each produced dorsally to well-defined, acute projections. Cephalon 

 fully as long as the first 2 segments of mesosome combined, and rather deep, 

 rostral projection comparatively small, lateral corners obtusely rounded, 

 postantennal ones produced to a rather prominent spiniform projection. 

 Anterior pairs of coxal plates about as deep as the body; 1st pair not 

 expanded distally, but having the anterior corner somewhat angular and the 

 distal edge, like the 2 succeeding pairs, minutely serrated; 4th pair much 

 larger than the preceding ones and considerably widening distally, posterior 

 edge deeply sinuated, infero-posteal corner rather produced. Penultimate 

 pair of epimeral plates of metasome with the posterior edge coarsely serrated; 

 last ])air forming a broad lamellar expansion, the lower corner of wliich is 

 acutely produced, whereas the upper one is boldly curved, posterior edge of 

 the expansion divided into 12 strong serrations, having between them small 

 bristles. Eyes in female of moderate size, in male considerably larger, in 

 both sexes oval reniform, with the anterior edge distinctly insinuated, pigment 

 very dark. Superior antennse in female scarcely exceeding Vs of the length 

 of the body, 1st joint of the peduncle about the length of the other 2 com- 

 bined, flagellum scarcely more than twice as long as the peduncle, and 

 composed of about 40 short articulations, the 1st of which is much the 

 largest. Inferior antennae neai-ly twice the length of the su])erior, and having 

 the flagellum very slender, about 3 times as long as the peduncle. Gnathopoda 

 of the usual slender form and feeble structure, propodos about the length of 

 the carpus, and very slightly widening distall3^ palm, as usual, short, and 

 defined below by an obtuse angle. Pereiopoda moderately strong, basal joint 



