279 



antennae in male nearly as long as tlie body, and having the joints of the 

 flagellum clothed with long sensitive setae. Inferior antennae of same struc- 

 ture in the 2 sexes, scarcely more than half as long as the superior and 

 much feebler, last joint of the peduncle shorter than the penultimate one, flagel- 

 lum somewhat exceeding the peduncle in length. Anterior gnathopoda with the 

 propodos a little shorter than the carpus, and nearly linear in form. Posterior 

 gnathopoda scarcely longer than the anterior, but considerably more powerful 

 in structure, propodos about the length of the 3 preceding joints combined, 

 and subtriangular in form, its proximal part somewhat constricted, distal part 

 greatly expanded, palm nearly transverse, and defined below by a short denti- 

 form projection, its edge slightly curved, and having on each side 7 spi- 

 nules. Pereiopoda very slender, and nearly of equal length, basal joint of the 

 3 posterior pairs moderately expanded, oblong oval in form, and obliquely 

 truncated at the infero-posteal corner. Last pair of uropoda rather slender 

 and elongated, basal joint longer than the other 2 combined, thickened at the 

 base, and without any denticles, but produced at the end inferiorly to a sharp 

 triangular projection, 2nd joint twice as long as the terminal one, and armed 

 at the end with 2 juxtaposed small denticles. End of telson reaching about to 

 the middle of the basal joint of the last pair of uropoda. Colour more or 

 less dark brownish from numerous pigmentary spots forming irregular shadows 

 descending down the coxal plates, peduncle of the superior antennae chestnut- 

 brown. Length of adult female somewhat exceeding 3 mm; that of male 

 considerably less. 



Remarks. There cannot in my opinion be any doubt about the identity 

 of Boeck's Cressa Scli0dtei with Dtninio <lnl>i<i of Sp Bate, especially after the 

 redescription of the latter form by the Rev. Mr. Stebbing. The figure given 

 by Sp. Bate is far from being good, and the description contains several 

 apparent errors, probably arising from the bad preservation of the solitary 

 specimen examined, and thus it may easily be explained that Boeck could 

 not recognize this form. From the 2 other species, the present one is readily 

 known by the recurved dorsal projections, which give the posterior part of 

 the back a peculiar, ragged appearance. 



Occurrence. - I have met with this form in several places, both off 

 the west and south coast of Norway, as also in the Trondhjemsfjord, at 

 depths varying from 20 to 80 fathoms. Boeck records it only from 

 Haugesund. 



Distribution. British Isles (Sp. Bate), coast of France (Chevreux). 



