444 



transversely truncated at the tip, postantennal ones produced to a very strong, 

 deflexed, spiniform projection, minutely serrated on its anterior edge. Anterior 

 pairs of coxal plates comparatively small, scarcely as deep as the body; the 

 first 3 pairs rounded quadrangular in form, and slightly serrated on their 

 distal edge; 4th pair but little expanded distally. Penultimate pair of 

 epimeral plates of metasome not serrated at the posterior corners; last pair 

 forming a broad, transversely truncated expansion regularly serrated on the 

 edge, and having the inferior corner not at all produced, the superior one 

 slightly upturned, and defined above by a deep sinus, in front of which there 

 is a slight projection of the posterior edge. Eyes of quite an unusual size 

 and obliquely oval in form, nearly contiguous above, visual elements very 

 conspicuous, pigment dark brown. Superior antennae scarcely attaining 1 /s 

 of the length of the body, 1st joint of the peduncle about the length of the 

 other 2 combined, and produced at the end posteriorly to a small dentiform 

 projection, nagellum twice the length of the peduncle. Inferior antennae fully 

 twice the length of the superior, and of the usual structure. G-nathopoda 

 of much the same appearance as in A. tridentata. Pereiopoda somewhat more 

 slender, with comparatively longer dactyli, basal joint of the 3 posterior 

 pairs less expanded, being oblong oval in form and having the posterior edge 

 but slightly serrated. Last pair of uropoda with the rami somewhat more 

 elongated, otherwise of much the same structure as in the said species. Telson 

 oval triangular, scarcely twice as long as it is broad at the base, tip some- 

 what blunted and bidentate. Body semipellucid, with a yellowish orange 

 tinge, each segment being bordered posteriorly by a narrow transverse band 

 of a light reddish hue; antennae and legs partly banded with the same 

 pigment. Length of adult female 11 mm. 



Remarks. The present species bears some resemblance both to A. 

 tridentata and A. bispinosa. With the latter it agrees in the presence of only 

 2 dorsal projections, with the former in the shape of the lateral corners of 

 the cephalon and of the gnathopoda. From both it distinguishes itself 

 prominently by the extraordinary development of the eyes, by the greatly 

 produced postantennal corners of the cephalon, and by the shape of the last 

 pair of epimeral plates of metasome, and that of the telson. 



Occurrence. I have only seen a single specimen of this form, an 

 adult female, which was found in the Varangerfjord, at Buge, in a depth of 

 50 GO fathoms. Out of Norway it has not yet been recorded. 



