323 



inferior ones, joints of the peduncle rather elongated and successively 

 diminishing in size, each provided at the end with stiff diverging bristles, 

 flagellum shorter than the peduncle, and composed of 5 articulations only, 

 the last of which is the longest; same antennae in male very unlike 

 those in female, the peduncle being greatly tumefied and having the 2 

 outer joints very short and thick, flagellum more than twice as long as 

 the peduncle, with the 1st joint enormously developed, even exceeding in 

 length the remaining 4 joints combined, and provided with dense tufts 

 of long and delicate sensory bristles arranged in a double series. Inferior 

 antennae exactly alike in the two sexes, the 2 outer joints of the peduncle 

 elongated and slender, nearly equal-sized, flagellum scarcely longer than the 

 last peduncular joint, and composed of 5 articulations only. Anterior 

 gnathopoda with the propodos fully as long as the 3 preceding joints com- 

 bined, and oval in form, palm rather oblique and longer than the hind 

 margin, carpal lobe scarcely extending to the palm of the propodos. Posterior 

 gnathopoda nearly of same size as the anterior, propodos not fully as broad 

 as in the latter, carpal lobe much narrower, and extending to the palm of the 

 propodos. Pereiopoda rather slender and not very densely setous, the 2 an- 

 terior pairs having the meral joint but little expanded, propodal joint about 

 the length of the latter, and somewhat longer than the carpal one, dactylus 

 rather slender. The 2 succeeding pairs successively increasing in length, basal 

 joint rather expanded, dactylus very slender and elongated. Last pair of 

 pereiopoda, as usual, much longer than the preceding pairs, and of quite normal 

 structure. The first 2 pairs of uropoda reaching about to the same transverse 

 line, and scarcely extending beyond the basal part of the last pair. The latter 

 nearly twice as long as the urosome, rami somewhat longer than the basal 

 part and very narrow, lanceolate, unarmed. Telson extremely small, scarcely 

 longer than it is broad, tip slightly emarginated. Body pellucid, whitish, 

 with a faint yellowish tinge. Length of adult female scarcely attaining 

 5 mm, that of male 4 mm. 



Remarks. The present form, the type of the genus, has much the 

 outward appearance of a Monoculodes, and may easily, without a closer exami- 

 nation, be considered as such, the more so as the last pair of uropoda, owing 

 to their great brittleness, are generally lost in the specimens captured. 

 The rather powerful and uniform structure of the 2 pairs of gnathopoda will 

 however, even in this case, serve for distinguishing this form from the species 

 of the genus Monoculodes. 



Occurrence. I have met with this form rather sparingly in a few 



places off the west coast of Norway, and recently also in the Trondhjems- 



