145 



and arranged in form of a rosette. A single eye present. Antennae not adapted 

 for swimming, both pairs remarkably short and stout, the anterior ones 6-arti- 

 culate, with the terminal part not sharply marked off from the basale cue, 

 and armed with strong spiniform setae; the posterior ones with a small bisetose 

 exopodal lobule at the end of the basal part, terminal part 3-articulate, 1st joint 

 the largest and provided behind with a group of small sensory threads, 

 penultimate joint, as in other Cypridae, produced at the end in front to a claw- 

 bearing prominence. Anterior lip lamellarly produced in front. Mandibles 

 with the cutting edge straight and finely dentate, palp large geniculate, 3-arti- 

 culate, basal joint provided inside with a pectinate row of slender ciliated 

 setae, and in front with a small vibratory plate edget with short setae. Maxillae 

 with the masticatory lobes short and stout, proximal joint of palp thickened and 

 produced in front, distal joint small; vibratory plate large and broad. Max- 

 illipeds produced in front to a well developed masticatory lobe, and provided 

 outside with a rounded vibratory plate edged wit numerous setae; palp pedi- 

 form, 3-articulate. Legs elongate, both pairs of similar structure, the posterior 

 ones however, as a rule, extended backwards and somewhat upwards within 

 the cavity of the shell. Caudal rami quite absent, the body terminating in a 

 simple conical process. Ripe ova received within the posterior roomy part of 

 shell-cavity for further development. 



Remarks. This genus was established in the year 1870 by Brady and 

 Robertson; but as the name Polycheles proposed had been preoccupied, it was 

 subsequently (in 1872) changed to Darwinella, and again in 1889 to Dar- 

 winula, because also the name Darwinella had turned out to be preoccupied. 

 The genus as yet only comprises 2 species; but I have had an opportunity 

 of examining one or 2 additional species from South America (Peru). Only 

 the type species is represented in the Fauna of Norway. 



63. Darwinula Stevenson! (Brady & Robertson). 



(PI. LXVII). 



Polycheles Stevensoni, Brady & Robertson. Ann. Mag. Nat. Hist. ser. IV, Vol. VI, pag. 25, 



PI. VII, figs. 17, Pi. X, figs. 414. 

 Syn: Argilloecia aurea, Brady & Robertson. 

 Darwinella Stevensoni, Brady & Robertson. 

 ,, Darwinula improvisa, Turner. 

 aurea, G. W. Miiller. 



Specific Characters. Female. Shell, seen laterally, narrow cuneiform in 

 shape, gradually tapered in front, greatest height far behind and about equal 

 to 2 /o of the lenght, dorsal margin almost straight and gently sloping in front, 



18 -- Crustacea. 



