478^ 



with a yellowish tinge, and more or less distinctly mottled with brown and 

 pink, uropoda generally very dark coloured. Length of adult female scarcely 

 attaining 4 mm. 



EemarJcs. - This species, established by Boeck, is easily distinguishable 

 from the preceding one by its small size and comparatively stout form of 

 body, as also by the rather different shape of the basal joints of the 3 

 posterior pairs of pereiopoda. The form described by Sp. Bate as D. 

 Irniiicornis is most probably identical with the present species. 



Occurrence. I have met with this form rather frequently in 



numerous places on the Norwegian coast, from the Christianiafjord to Vadso. 

 It generally occurs in comparatively shallow water, among algae. 



Distribution. Shetland Isles (Norman), British Isles (Robertson), 



Kattegat (Meinert), coast of France (Chevreux). 



(ren. 4. Trltseta, Boeck, 1876. 



Syn. : Atylus, Sp. Bate (part). 

 Lampra, Boeck. 



Body scarcely compressed, and having the segments of metasome not 

 produced dorsally. Cephalon comparatively small and truncated in front, 

 with the rostrum nearly obsolete. Coxal plates very small, and partly of 

 irregular angular form. Eyes well developed and placed as in Dexamine. 

 Antennae very slender and subequal in length, the superior ones with greatly 

 elongated peduncle, and without any accessory appendage. Oral parts on 

 the whole resembling those in the genus Dexamine. G-nathopoda likewise of 

 a very similar structure. Pereiopoda very strongly built and subequal in length, 

 with the meral joint in all very much elongated, and the 2 outer ones modified 

 so as to make them admirably adapted for grasping, basal joint of the 3 

 posterior ones but little expanded. Branchial lamellae simple. Uropoda and 

 telson about as in Dexamine. 



Een> 1 1 r /,:-. This genus was first established by Boeck in the year 



1 S 70, but as the name he proposed, Lantpra, was already appropriated in 

 Zoology, he changed it subsequently to Trihcta. It is nearly allied to 

 Des-tninni: yet differing rather markedly in the small size of the coxal plates, 

 the equal-sized antennae, and the peculiar structure of the pereiopoda, Besides 



