280 



31. Cressa minuta, Boeck. 



(PL 99, fig. 2). 

 Cressa ininntu, Boeck, Crust, amph. bor. & arct, p. 66. 



Body comparatively more slender than in the- type species, back quite 

 smooth throughout. Cephalon with the lateral corners rather produced and 

 terminating in an acute point, inferior edges smooth, without any trace of a 

 dentiform projection. Second and 3rd pairs of coxal plates each with 

 only a simple anteriorly-curved tooth at the infero-posteal corner; 4th pair 

 nearly twice as deep as the corresponding segment, and narrowly truncated 

 at the tip, posterior projection less acute than in the type species. Last 

 pair of epimeral plates of metasome somewhat less produced at the late- 

 ral corners. Eyes comparatively small and of rounded form. Antennae 

 nearly as in C. d tibia, but with the flagella composed of a smaller number of 







articulations, that of the superior ones being only 12- articulate. Anterior 

 gnathopoda with the propodos comparatively small, scarcely more than half 

 as long as the carpus. Posterior gnathopoda very like those in C. dttljia, but 

 with the propodos a little more elongated, and having only 4 5 spinules on 

 each side of the palmar edge. Basal joint of the 3 posterior pairs of perei- 

 opoda rather expanded and of regular oval form, infero-posteal corner evenly 

 rounded. Uropoda and telson about as in C. dnlna. Colour in the living state 

 of the animal not yet stated. Length of adult female about 3 mm. 



Remark*.-- The present species, established by Boeck, is nearly allied 

 to C. fliibia, though, on a closer inspection, easily distinguishable by the 

 absolute want of dorsal projections, as also by the inferior edges of the 

 cephalon being quite smooth. The comparatively smaller and rounded eyes, 

 and the somewhat different form of the basal joint of the 3 posterior pairs 

 of pereiepoda, will likewise serve to distinguish this species from the 

 type one. 



Occurrence. I have only seen a few specimens of this form, which 

 were collected by me in 3 different places, viz., at Riser, south coast of Nor- 

 way, at Sunde and Bekkervig, both belonging to the west coast. Boeck found 

 it at Haugesund. Out of Norway, it has not yet been recorded. 



