203 



and the short and broad caudal rami. The Attheyella eryptorum of Brady is 

 unquestionably identical with the present species, and this is also the case with 

 the form recorded by Poppe as Canthocamptus Borcherdingi. 



Occurrence. I have met with this form not unfrequently in the neigh- 

 bourhood of Christiania, as also in some other places of the country. It is gener- 

 ally found in small ditches and shallow streams, more rarely in larger lake near 

 the border. 



Distribution. Sweden (Lilljeborg), British Isles (Brady), Germany (Poppe), 

 Holland (v. Breemen). 



128. Attheyella arctica (Lilljeborg). 



(PI. CXXXII). 



Canthocamptiis arcticus, Lilljeborg, Synopsis Harpacticidarum aqvse dulcis Svecise, Kgl. Svenska 

 Vet. Akad. Handl. Bd. 36. p. 37, PI. II, fig. 23, PI. Ill, figs. 14. 



Specific Characters. Female. Body somewhat more slender than in A. 

 mjymcea and gradually attenuated behind. Rostral projection small, but distinct. 

 Urosome with the segments minutely spinulose at the hind edge ventrally and 

 laterally, last segment about the length of the preceding one, anal opercle fringed 

 with about 16 comparatively small denticles. Caudal rami of moderate size and 

 somewhat divergent, broad at the base and slightly tapering distally, dorsal face 

 exhibiting a rounded gibbosity fringed with a transverse series of thin setiform 

 spinules, tip transversely truncated, apical setae rather elongated, distal seta of 

 outer edge attached close to the apex. Anterior antennse of moderate length, 

 with the proximal joints slightly dilated, terminal part rather narrow and fully 

 as long as the proximal one. Posterior antennae with the outer rarnus compara- 

 tively small, uniarticulate. 1st pair of legs with the rami of about equal length, 

 the inner one biarticulate, distal joint shorter than proximal. Natatory legs with 

 the outer ramus very strongly built, that of 4th pair scarcely more slender than 

 in the other 2 pairs and abruptly bent inwards. Last pair of legs comparatively 

 large, distal joint oval in form, inner expansion of proximal joint broadly lingui- 

 form and extending beyond the distal joint, marginal setae 6 in number and, 

 except the outermost one, very long and curved. 



Male with the inner rami of the natatory legs more or less differing in 

 shape and armature from those in female, that of 3rd pair, as usual, the most 

 conspicuously transformed, being composed of 3 joints, the middle one exserted 

 inside to a deflexed lanceolate process, last joint terminating in a short spine, 

 inside which a likewis short angularly bent seta is attached. Last pair of legs 



