296 



of the peduncle taken together; those of adult male less elongated than 

 usual, and but little exceeding half the length of the body. Anterior gna- 

 thopoda rather strong, propodos oval in form, about twice as long as it is 

 broad, palm very oblique, and longer than the hind margin, from which it is 

 difined by a very slight angle armed with a slender spinule, carpal lobe densely 

 setous, linguiform, and produced beyond the hind margin of the propodos. 

 Posterior gnathopoda very slender, propodos nearly linear in form, and more 

 than 4 times as long as it is broad, palm short and somewhat oblique, but 

 distinctly defined below, carpal process extremely narrow and elongated, ex- 

 tending somewhat beyond the hind margin of the propodos. Pereiopoda, sav- 

 ing the last pair, comparatively short and stout, and very densely setous, 

 dactylus in all extremely small, propodal joint of the 2 anterior pairs rather 

 narrow and longer than the carpal one. Last pair of pereiopoda much elon- 

 gated, considerably exceeding half the length of the body, basal joint oval, 

 with the posterior edge somewhat irregularly curved, and fringed with short 

 bristles, the 3 outer joints nearly of equal length, each longer than the meral 

 one. Last pair of uropoda with the rami longer than the basal part, and 

 narrow lanceolate in form, each armed with about 5 strong spines. Telson 

 oval quadrangular, somewhat dilated in the middle, terminal edge transversely 

 truncated. Body more or less densely mottled with a yellowish white and 

 a dark brownish pigment, the latter forming partly transverse bands, of 

 which that extending across the 1st segment of mesosome and corresponding 

 coxal plates, is generally the most conspicuous one; ova in the marsupial 

 pouch of a fine rose colour. Length of adult female 11 mm, that of male 

 9 mm. 



Remarks. - There cannot, in my opinion, be any doubt about the iden- 

 tity of the above-described form with the M. carinatns of Sp. Bate. As this 

 name is much older than that of a f finis proposed by Bruzelius and adopted 

 by Boeck, the species ought to be named as above. According to Mr. Nor- 

 man, the M. Stimpsonii of Sp. Bate is only the young male of this species. 

 From the other forms belonging to this genus, the present one may be easily 

 distinguished by the strongly -vaulted frontal part, the very large elliptical 

 eyes, and the densely setous pereiopoda, the dactylus of which is moreover 

 extremely small. 



Occurrence. - - I have met with this form rather abundantly off Jsederen, 

 south coast of Norway, in a depth of 2 10 fathoms, fine sand. Quite soli- 

 tary I have also found it at Bejan, outer part of the Trondhjemsfjord, and 

 at Apelvser (Namdal). Boeck records it from 3 other places off the west coast 

 of Norway, viz., Haugesund, Aalesund and Christiansund. 



