39 



hroader tlian tlu' succeeding ones, accessory a]j]5endage only very little 

 shorter tlian the flagellum, 5-articiilate ; those of male much more mas- 

 sive, ])eduncle greatly swollen, with the '2 outer joints nearly as l)i-oa(l 

 as the basal one, 1st joint of the flagellum very large and compla- 

 nated, with the inferior edge arched and densely beset with delicate and 

 slender sensitive hairs. Anterior gnathopoda with the propodos about as 

 long at the carjius, dactylus rather short. The 3 posterior pereiopoda 

 neai'ly uniform in length, or the ]ienultimate one a little longer, basal joint 

 very large, rounded ([uadrangular, meral joint, especially in the 2 anterior 

 ])airs, greatly dilated, renultimate pair of uropoda with the basal part much 

 broader than that of the jn-eceding pair and forming at the end posteriorly 

 an angular corner; last pair scarcely half as long as the preceding pair, rami 

 lanceolate, unarmed, the oiiter one the longer. Telson almost as broad as long, 

 rounded, and cleft beyond the middle. Colour pale oi'ange with light red 

 pigmentary bands across the segments. Length 5 mm. 



Eeniarh: — The form described by the author from the Noi'th Atlantic 

 Expedition as Acido.sfonia hd iconic is the male of a nearly related species, 

 which differs, in addition to its much larger size, in the total want of eyes and 

 in a somewhat ditferent form of the last pair of uropoda and of the telson. 

 A female specimen of the same species, measuring- 11 mm in length, was also 

 ol)tained on the Expedition, but was wrongly referred to the typical form. 

 On the coast of Norway this abyssal species has not yet been found; for the 

 specimen named so in my ^<Oversigt af Norges Crustaceer» I find on closer 

 examination to be more properly referable to the typical species. 



Occurrence. — I have met with the present form rather sparingly on 

 the south and west coast of Norway at moderate depths, from 2() to 50 

 fathoms. Prof Lilljeborg has taken it at Molde and Boeck at Haugesund; 

 finally Dr. Lindstrom has procured the species at Farsund. 



Dit'trihution. — Coast of Bohuslehn, British Islaiids, .Shetland. 



Gen. <;. IchnopUS, Costa, 1853. 



Body rather slender and compressed, with the coxal plates of moderate 

 size. Both pairs of antennse with the fiagella Tinusually elongated and com- 

 posed of numerous short articulations. Anterior lip slightly projecting anteriorly 

 as a short rounded lobe, defined from the epistome by a mirrow incision. 

 Bosterior lip strongly chitinised, with very slender and projecting lateral 

 corners. Mandibles rather strong, cutting edge broad, accessory lobe narrowly 

 rouiuled and separated from the latter only by a, small sinus, palp originating 



