654 



subsequently described more fully by the author. It is easily recogni- 

 zable from the other northern Caprellidse by the unusually short cephalosome, 

 the characteristic armature of the body, and the robust structure of the 

 posterior gnathopoda. 



Ocnirmice. - I have met with this form rather abundantly in the 

 Trondhjemsfjord, as also at Bode and Hammerfest, in depths ranging from 

 50 to 100 fathoms, clinging to Hydroida.- According to Boeck, it also occurs 

 off the west coast of Norway, at Haugesund. 



Distribution. Greenland (Hansen), - 



Gen. 5. PariambuS, Stebbing, 1888. 



Syn.: Podalirius, Kr0yer. 

 Caprella, Sp. Bate (part). 



Body not very slender, smooth, with a distinct dorsal impression be- 

 tween the cephalon and the 1st segment of mesosome. Antennae in female 

 comparatively short, in male somewhat more elongated, the inferior ones with 

 the flagellum biarticulate. Mandibles without any trace of palps. Maxilli- 

 peds with the masticatory lobes much larger than the basal ones. Anterior 

 gnathopoda of the usual structure. Posterior gnathopoda with the propodos 

 oval in form, and sometimes rather differently shaped in the male. The 2 

 anterior pairs of pereiopoda quite wanting; antepenultimate pair rudimentary, 

 forming on each side a very small biarticulate appendage; the last 2 pairs 

 well developed, with the propodal joint long and slender. Branchial lamellae 

 only present on the 3rd and 4th segments of mesosome. Urosome with a 

 very slight rudiment of a pair of appendages. 



Remarks. This genus was established by Kroyer in the year 1844, 

 but as the name he proposes, Podalirius, was already appropriated in Zoology, the 

 Rev. Mr. Stebbing has changed it to Pari ambus. The genus was not accepted 

 by Sp. Bate, who referred the type species to the genus Caprella. It is, 

 however, pretty well distinguished from that genus by the rudimentary condi- 

 tion of the antepenultimate pair of pereiopoda. Besides the Norwegian species 

 described below, Dr. P. Mayer records 2 Mediterranean species, as P. Kr0yeri 

 and 



