601) 



Bernards. The present form was first described by Sp. Bate from 

 female specimens as Siphonoecetes crass iconic, and was subsequently recorded 

 by the author from the Norwegian coast. It is easily distinguished both 

 from the type species and from the 2 forms described by the Rev. Mr. Steb- 

 bing from the Challenger Expedition, by the comparatively short and stout 

 antennae, and by the peculiar structure of the posterior gnathopoda in 

 the male. 



Occurrence. The only place, where I have hitherto met with this 

 peculiar Amphipod, is outside Jsedern, in a depth of 4050 fathoms. The 

 animal inhabits a free, membranous tube of a rather regular, short cylindrical 

 form and open at both ends. When it withdraws itself into the tube, the 

 large basal joints of the superior antennas close the aperture like an operculum. 



Distribution. - British Isles (Sp. Bate). 



Gen. 2. SiphonOGCetes, Kroyer, 1845. 



Body slender and narrow, with the metasome and urosome very small. 

 Cephalon but slightly produced in front, lateral lobes narrowly produced between 

 the insertions of the 2 pairs of antennas. Coxal plates very small, and but little 

 different in size. Eyes more or less developed, placed at the extremity of the 

 lateral lobes of the cephalon. Antennae more or less densely setiferous and 

 rather unequal, the superior ones being comparatively slender, without any acces- 

 sory appendage, but with the flagellum well developed, the inferior ones much 

 longer than the superior and also more strongly built, subpediform, with the 

 flagellum rather short and armed at the tip with unguiform spines. Mandibular 

 palps small, consisting of only a single joint densely setous at the tip and inner 

 edge. Gnathopoda of the very same structure in the two sexes, and some- 

 what unequal, the posterior ones being considerably stronger than the ante- 

 rior, and distinctly subcheliform. Anterior pairs of pereiopoda witli the 

 basal and meral joints much expanded; antepenultimate and penultimate 

 pairs comparatively small, and of same structure, with the dactylus inverted; 

 last pair considerably more elongated, and having the basal joint lamellarlv 

 expanded, and fringed on both edges with long, ciliated setse. Branchial 

 lamella? of moderate size, wanting at the base of the posterior gnathopoda. 

 Pleopoda well developed, with the basal part considerably expanded inside. 

 The 2 anterior pairs of uropoda biramous, with the outer ranms the larger, 

 and spinulous outside; last pair with the basal part laminarly expanded, 



