54 
7. Diastylis Goodsiri (Bell) 
(PI. XLI.) 
Alauna Goodsiri, Bell, in Belcher’s Last of the Arctic Voyages, Yol. II, p. 403, 
PI. XXXIV, fig. 3. 
Syn: Diastylis plumosa, M. Sars. 
Specific Characters. — Female. Body of very robust form, and thickly 
covered all over with short plumose hairs, anterior division considerably tumefied 
and broadly oval in form, with the dorsal face boldly arched. Carapace large 
and deep, fully twice as long as the exposed part of the trunk, and greatly 
vaulted above, surface without any spines or denticles; pseudorostral projection 
rather produced, conical, horizontal, subrostral corners obsolete. Last pedigerous 
segment with the lateral parts scarcely produced behind. Tail (exclusive of the 
terminal appendages) somewhat shorter than the anterior division, lateral corners 
of the 5 anterior segments much produced, spiniform. Eye inconspicuous. Sup¬ 
erior antennae with the 1st joint of the peduncle very large, much longer than 
the other 2 combined, and clothed at the tip with numerous long plumose sets, 
last joint shorter than the 2nd. Inferior antennae with the terminal joint un¬ 
usually large, conically produced, apical seta very much elongated. First pair of 
legs scarcely longer than the carapace, basal joint almost attaining the length of 
the remaining part of the leg, and spinulose in its distal part, being moreover 
fringed with numerous long plumose setm, the last 3 joints not very different 
in length; 2nd pair with the basal joint rather large and curved, being minutely 
denticulate outside, and fringed along the lower edge with a dense row of long 
plumose setse, antepenultimate joint longer than the last 2 combined; 3rd and 
4th pairs comparatively strongly built and densely setiferous, basal joint partly 
denticulate. Uropoda with the rami subequal in length, and about half as long 
as the stem, inner ramus mucronate, with the joints imperfectly defined, spinules 
of the inner edge about 12 in number and, like those of the stem, unusually 
slender, setiform. Telson rather produced, reaching as far as the stem of the 
uropoda, proximal thickened part comparatively short, distal part armed on each 
side with numerous slender, setiform spinules, amounting to 20 in all, apical 
spinules very small. Colour whitish. Length about 25 mm. 
Remarks .—This form was first recorded by Bell from the polar islands 
of America as Alauna Goodsiri, and was some years afterwards found off the 
Finmark coast by my late father, who regarded it as new, and described it 
briefly under the name of Diastylis plumosa. It is by far the largest of all 
