80 



Occurrence. Boeck observed this form at Karmo, west coast of Norway. 

 I have myself met with it in several localities both on the south and west coasts, 

 from the Christiania Fjord northwards at least to the Trondhjem Fjord. In 

 none of these localities did it occur, however, in any abundance. In habits it 

 seems to be less pronouncedly pelagic than the species of Centropages, being 

 sometimes found close to the shore among algae. On the other hand, I have 

 never found it in any of the samples of plankton taken in the open sea. Yet it 

 cannot properly be considered as a true bottom-form, as I have found it occa- 

 sionally, for instance, at the Zoological Station at Drobak, close to the surface 

 of the sea. 



Distribution. Mediterranean (Giesbrecht), coast of France (Canu), British 

 Isles (Brady), Atlantic Ocean between Lat. 36 and 60 N. (Giesbrecht). 



Gen. 22. LimnOCalailUS, G-. 0. Sars, 1863. 



Generic Characters. Form of body slender and elongated. Cephalosome 

 well defined from the 1st pedigerous segment; front with 2 very small soft appen- 

 dages below. Last segment of metasome likewise distinctly defined from the 

 preceding one, its lateral parts not expanded. Urosome slender, 3-articulate in 

 female, 5-articulate in male. Caudal rami narrow linear, with the appendicular 

 bristle rather elongated. Eye small, subventral. Anterior antennae slender, 

 consisting in female of 25 articulations, last joint well defined, but very small; 

 right anterior antenna in male geniculate. Posterior antennae with both rami 

 slender, the outer one the longer and distinctly 7-articulate. Mandibles with 

 the masticatory part considerably expanded, the 2 outer denticles of the cutting 

 edge simple, unguiform, palp comparatively narrow, with the inner ramus reflexed. 

 Maxillse quite normal. Anterior maxillipeds powerfully developed, with the 

 distal appendages transformed to long, claw-like spines. Posterior maxillipeds 

 unusually elongated. Legs slender, with the 2nd basal joint rather elongated, 

 inner ramus in all pairs 3-articulate, terminal joint of outer ramus with only 2 

 spines outside. Last pair of legs in female with the unguiform projection of the 

 outer ramus well marked; those in male with the outer rami biarticulate, distal 

 joint of left leg oblong lamellar with 4 marginal spines, that of right leg some- 

 what club-shaped and produced inside to a long deflexed spiniform process. No 

 ovisac present in female. 



