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 nun., 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 nlso found by 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. 



(PI. XLL1.) 



Diastylis spinulosa, Heller, Crust., Pycn. uml 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 



