367 



Occurence. The species was first detected by my late father at 

 Christiansund, living in a semiparasitic state on the skin of Holotlmria 

 tremula. I have found it under similar circumstances in some other places, 

 both off the south and west coasts of Norway. It is for instance not 

 uncommonly met with in the outer part of the Christianiafjord, where the 

 type species would seem to be wholly wanting. Out of Norway it has not 

 yet, with certainty, been recorded. 



3. Epimeria tuberculata, G-. 0. Sars, n. sp. 



(PI. 129, fig. 2). 



General habitus about as in the 2 preceding species. Dorsal carina 

 beginning with the penultimate segment of mesosome, and having the projec- 

 tions rather blunt; subdorsal keels very slight and without airy dentiform 

 projections. First segment of urosome with a very conspicuous narrow 

 saddle-like depression dorsally, below which there is a rather low rounded 

 prominence tipped by a blunt mammilliform projection. Cephalon with 

 the rostrum nearly straight, and but little projecting beyond the basal 

 joint of the superior antennae, postantennal corners subangular at the 

 tip. The 3 anterior pairs of coxal plates somewhat blunted at the tip; 4th 

 pair comparatively smaller than in the other species, and having the outer 

 part much shorter, and less distinctly falciform; 5th pair with the posterior 

 projection blunt at the tip. Last pair of epimeral plates of metasome about 

 as in E. cornigera, having, like the preceding pairs, above the lateral corners 

 a distinct angular projection. Eyes of moderate size, rounded, and rather 

 prominent, pigment a light carmine. Superior antennas comparatively short, 

 scarcely exceeding V& of the length of the body, 1st joint of the peduncle rather 

 large, and much longer than the other 2 combined, flagellum scarcely more 

 than twice as long as the peduncle, and composed of about 24 articulations. 

 Inferior antennae considerably longer than the superior, last joint of the 

 peduncle shorter than the penultimate one, flagellum two and a half times as long 

 as the peduncle. Gnathopoda with the propodos much shorter than the car- 

 pus, and very narrow, scarcely at all widening distally. Last pair of pereio- 

 poda with the basal joint not nearly attaining the length of the remaining 

 part of the leg, posterior edge slightly curved, infero-posteal corner blunted. 

 Last pair of uropoda about as in E. cornigera. Telson rather broad, scarcely 

 longer than it is broad at the base, posterior sinus very slight, terminal 

 lobes bluntly rounded. Colour whitish, with a very faint rosy tinge. Length 

 of adult female reaching 16 mm. 



Remarks. In the living state the present new species is at once 



