257 



with a sharp corner. Eyes very minute, rounded, pigment dark red. Antennae 

 rather slender, the superior ones exceeding half the length of the body, 1st 

 joint of the peduncle about the length of the cephalon, 2nd joint scarcely 

 shorter, flagellum half as long again as the peduncle, and composed of about 

 11 articulations. Inferior antennae nearly as long as the superior, the 2 

 last joints of the peduncle rather slender, and about equal-sized, flagellum 

 half the length of the peduncle. Anterior gnathopoda rather feeble, meral 

 joint but little produced at the end inferiorly, carpus comparatively elongated, 

 propodos considerably shorter, and nearly linear in form. Posterior gnathopoda 

 moderately strong, propodos nearly triangular in form, gradually widening 

 distally, palm somewhat oblique, but shorter than the hind margin, from 

 which it is defined by a rather strong acute projection, its edge nearly 

 straight and slightly serrated. Same legs in male but little different, having 

 only the propodos somewhat more elongated. First pair of pereiopoda rather 

 slender and elongated; the 3 posterior pairs successively diminishing in 

 length, and having the propodal joint rather elongated, and the dactylus 

 strong and curved; last pair with the basal joint scarcely more than half 

 as long as the remaining part of the leg, and regular oval in form, meral 

 joint produced beyond the middle of the carpal one. Last pair of uropoda 

 rather slender, basal joint scarcely longer than the 2nd, and armed with 2 

 denticles only, terminal joint elongated, mucroniform. Telson oblong oval, 

 nearly twice as long as it is broad, and armed with 2 pairs of dorsal den- 

 ticles. Body whitish pellucid, with a row of stellated pigmentary patches of 

 a dark brownish gray hue along the back, coxal plates partly tinged with 

 a similar pigment, and besides with a light greenish colouring. Length of 

 adult female scarcely exceeding 3 mm. 



Remarks. I have formerly erroneously confounded this species 

 with M. Bruzelii of Goes, from which it is however readily distinguished by 

 the more slender, antennae and the rather different structure of the posterior 

 gnathopoda. When alive, it is moreover at once distinguished from most 

 other species by its peculiar coloration. 



Occurrence. I have met with this diminutive species in several 

 places, both on the south and west coasts of Norway, as also in the Trond- 

 hjemsfjord. It occurs, as a rule, in comparatively shallow water among 

 algae and Hydroidae. 



