635 



and elongated, the superior ones longer and more strongly built than the 

 inferior, and provided witli a small accessory appendage. Mandibular palps 

 not very large, with the terminal joint not expanded. Basal lobe of 1st 

 pair of maxillse very small. Maxillipeds large, with the masticatory lobes 

 concaved inside and edged with slender spines. Gnathopoda in female sub- 

 equal, in male very unef|ual, the anterior ones of same structure in the two 

 sexes, being rather slender and feeble, with the carpus comparativelj' large, 

 and the propodos small, not subcheliforra. Posterior gnathopoda in female 

 with the carpus shorter than in the anterior, and the propodos generally 

 larger; those in male very powerfully developed, with the propodos exceed- 

 ingly large, and more or less strongly produced below. The 2 anterior pairs 

 of pereiopoda comparatively small and feeble; the 3 posterior pairs much 

 stronger, with the Ijasal joint linear and the meral joint much elongated; 

 last pair longer than the 2 preceding ones. Branchial lamellae narrow cylin- 

 dric in form; incubatory lamellae very broad, especially the 2 middle pairs. 

 Pleopoda very large, with the basal part much elongated and strongly 

 muscular. The 2 anterior pairs of uropoda well developed, with narrow 

 linear i-ami; last pair entirely wanting. Telson oval, rounded at the tip. 



liemarhs. — Thi.s genus was e.stablished in the year 1845 by Kroyer, 

 to include an arctic species D. spinosissima. The genus Dyopedos of Sp. Bate 

 is identical with Kroyer's genus. The species of this genus may be easily 

 recognized by their extremely slender and elongated body, somewhat remind- 

 ing of the Caprellida;, from which they are however, at once distinguished 

 by the much fuller development of the posterior divisions of the body 

 (metasome and urosome) with their respective appendages. The genus com- 

 prises 6 Norwegian species, to be described below Two new species have 

 also been described by the author from the Norwegian North Atlantic 

 Expedition, and 1 have recently had an opportunity of examining another 

 species found by the Rev. Mr. Norman in the Trondhjemsfjord. The latter 

 will be described and figured in an appendix to the present work, as D. Normavi. 



4. Dullchia spinosissima, Kroyer. 



(IM. 228). 

 Dulichia spinosissima, Kr0yer, Nat. Tidsskr. 2 ser. Vol. 1. p. 612; PI. VI, fig. 1. 



Body somewhat robust, with the anterior segments of mesosome pro- 

 jecting laterally to acute triangular lappets ; last segment of mesosome and 

 the 2 anterior ones of metasome each with 2 juxtaposed, tnberculiform dorsal 

 prominences; last segment of metasome produced at the end dorsally to a 



