611 



armed with 6 strong spines increasing in size distally. Anterior pairs of 

 pereiopoda with the meral joint very large and expanded, nearly cordiform in 

 outline, carpal joint in these and the 2 succeeding pairs very short. Last 

 pair of pereiopoda rather slender, with the basal joint obliquely oval in form, 

 propodal joint elongated, and provided outside with fascicles of long and 

 slender setae. Last pair of uropoda with the basal joint expanded inside to 

 a broad setiferous lobe, terminal joint exceeding half the length of the basal 

 one, and carrying on the obliquely truncated tip a short spine and 7 slender 

 bristles. Body of a light, greyish white hue, and more or less densely varie- 

 gated with yellowish and brown pigment; inferior antennae with alternating 

 yellow and brown bands. Length of adult male 8 mm. 



Remark*. - - This species, established by Boeck, is nearly allied to S. 

 tupicns of Kroyer, differing however in the somewhat more slender form of the 

 body, and in the greater length of the superior antennae and the less robust 

 form of the inferior ones, both pairs being moreover less densely setous. 

 Finally, the eyes are much more fully developed, and the lateral lobes of 

 the cephalon broader at the tip, and mor e produced. The S. nwcronatus of 

 Metzger is indistinguishable from this species. 



Occurrence. - I have met with this form occasionally in a few places 

 on the south and west coasts of Norway, in depths ranging from G to 20 

 fathoms. It inhabits an irregular flattened tube constructed of stones and 

 fragments of shells agglutinated together. 



Distribution. Kattegat (Meinert), West Frisian Coast (Metzger). 



3. Siphonoecetes pallidus, G-. 0. Sars. 



(PI. 218, fig. 2). 

 Siphonoecetes pallidus, G. O, Sars, Oversigt af Norges Crnstaceer I, p. 113, PI. G, fig. 7. 



Very like the preceding species, but rather inferior in size. Cephalon 

 with a distinct, though rather small rostral projection, lateral lobes extremely 

 narrow, and not widening at the tip. Coxal plates about as in the preceding- 

 species. Eyes imperfectly developed, and replaced on each side by a small 

 patch of an opaque whitish pigment. Superior antennae scarcely exceeding 

 half the length of the body, and not reaching to the end of the penultimate 

 peduncular joint of the inferior ones, joints of the peduncle successively 

 diminishing in size, flagellum about half the length of the peduncle, and 

 composed of 6 articulations. Inferior antennae nearly attaining the length 



