55 
known Cumacea, growing in the polar sea to a still larger size than off the 
Norwegian coast. Dr. Hansen gives the length of a specimen from the Kara 
Sea to no less than 35 mm., a truly gigantic size for a Cumacean. Like the 2 
preceding species, this form is distinguished by the total absence of any spines 
or denticles on the carapace, being however well distinguished not only by its 
much larger size, but also by several other characters mentioned in the above 
diagnosis. Dr. Hansen has given a most elaborate description of both sexes 
in his paper on the Crustacea procured during the Danish “Djimpha” Expedition. 
Occurrence .—I have not infrequently taken this huge form in the Varanger 
Fjord at Vadso, where it was also found hy my late father. It occurred here 
at a depth of about 60 fathoms, on a bottom consisting of very soft clay, with 
which the specimens were generally thickly covered. This form has also been 
found more recently in the fjords near Tromso, for instance the Malangen Fjord; 
but farther south it has not been observed. No fully adult male specimen has yet 
come under my observation; but Dr. Hansen describes such specimens from the 
Kara Sea, and from his figure and description, it appears that the transformation 
is perfectly analogous to that observed in other species of the genus. 
Distribution. Polar Islands of North America (Bell), Greenland (Hansen), 
Jan Mayen (Norw. North Atl. Exped.), Spitsbergen (do.), the Barents Sea (Hoek), 
the Kara Sea (Hansen), the Siberian Polar Sea (Stuxberg). 
8 . Diastylis spinulosa, Heller. 
(PL XLII.) 
Diastylis spinulosa, Heller, Crust., Pycn. uud Tunic. Oestr. Ungar., Nordpol Expd. p. 28, 
PI. 1, fig. 5. 
Specific Characters.— Female. Body somewhat resembling in its general 
form that of D. Goodsiri, but at once differing in its coarse spiny armature; 
anterior division rather tumid, and boldly arched dorsally. Carapace very large, 
more than twice as long as the exposed part of the trunk, and somewhat depressed 
in its anterior part, the dorsal face sloping rather steeply towards the base of 
the pseudorostral projection, surface without hairs, but exhibiting a number of 
very strong anteriorly-curving spiniform projections, especially densely crowded 
together on the upper part of the branchial regions, about 15 being counted on 
each side; a row of 4 strong spines also extends forwards to each side of 
the frontal lobe, occupying, in the dorsal view of the animal, the lateral edges, 
the frontal lobe itself having, somewhat in front of the middle, 2 somewhat smal¬ 
ler and more erect, juxtaposed spines; pseudorostral prominence horizontally 
