217 



of proximal joint rather broad, but scarcely extending beyond the middle of the 

 distal joint, marginal setae 4 in number. 



Body of whitish colour, with a more or less distinct bluish tinge. 



\ 

 Length of adult female 0.64 mm. 



Remarks. The specific name minuta proposed by Boeck for this species 

 is somewhat inappropriate, since it in reality cannot properly be said to range 

 among the smaller species of this genus, although being somewhat inferior in size 

 to the type species. The form described by Th. Scott as A. ambigua agrees with 

 the present species in the structural details and especially in the shortness of the 

 last joint of the inner ramus of the 1st pair of legs, for which reason I am in- 

 clined to believe it to be identical with Boeck's species, though the habitus-figure 

 (side-view of the animal) looks somewhat different by its more robust form. This 

 may however be due to an accidental contraction of the specimen drawn. 



Occurrence. This species is not uncommon in the upper part of the 

 Christiania Fjord in moderate depths among algae, and I have also found it oc- 

 casionally off the west coast of Norway, at Haugesund and Kopervik. 



Distribution. Scottish coast (Scott). 



138. Ameira tenuicornis, Scott. 



(PL CXLII). 



Ameira tenuicornis, Scott, in 20th Ann. Report of the Fishery Board for Scotland. Part III, 



p. 549, PI. XXIV, figs. 19. 



Specific Characters. Female. Body somewhat less slender than in the 

 preceding species, with the cephalic segment rather large and deep. Last segment 

 of urosome smaller than the preceding one. Caudal rami short, transversely 

 truncated at the tip. Anterior antennse very slender and considerably exceeding 

 in length the cephalic segment, the 2 basal joints much less dilated than in the 

 2 preceding species, terminal part not attaining half the length of the proximal 

 one. Mandibular palp with 2 setae inside the basal joint, the outer one rather 

 small and finely ciliated. 1st pair of legs with the outer ramus scarcely half as 

 long as the inner, the latter very slender, with the last joint narrow linear in 

 form and much longer than the very small 2nd joint, both together not attaining 

 half the length of the 1st. Natatory legs normal. Last pair of legs with the 

 distal joint oblong in form, distal seta of outer edge very small, inner expansion 

 of proximal joint scarcely extending to the middle of the distal joint, marginal 

 setae 4 in number. 



