41 
Remarlcs .—This form is very easily recognizable from our other Cumacea 
by its short, club-shaped body, and, indeed, its form appeared to Kroyer so 
unusual that he applied to it the specific name deformis (misshapen). A de¬ 
tailed description of the female of this species, accompanied by figures, has been 
given by the present author in his account of the Cumacea from the ‘Josephine’ 
Expedition. 
Occurrence .—Off the Norwegian coast this form seems to be rather rare. 
It was first found here by the late I)r. A. Boeck, who collected a few specimens 
at Haugesund, west coast of Norway; and I have myself subsequently taken it 
occasionally in 2 other places, viz., at Skudesnses and ofi the Jaederen coast. In 
both these places it occurred in comparatively shallow water, on a sandy bottom. 
Distribution .— Greenland (Kroyer), Kattegat (Meinert), Heligoland (Ehren- 
baum), Atlantic coast of North America (Verrill). 
Fam. 5. Diastylidae. 
Characters. —Body, as a rule, not very slender, with the anterior division 
more or less tumefied, and sharply marked oft’ from the slender, cylindrical tail. 
Carapace large, more or less vaulted above, pseudorostral projection distinct, 
lower edges serrate at least in their anterior half. First pedigerous segment 
well defined, though rather narrow, band-shaped. Segments of tail generally 
strongly emarginated above on the hind edge, and exhibiting a more or less 
pronounced nodular appearance. Eye present or wanting. Superior antennae 
slender, with both flagella distinctly developed. Inferior antennae in female form¬ 
ing a cylindrical stem divided into several successive joints. Mandibles well de¬ 
veloped, with numerous curved spines behind the cutting edge, its body of 
different shape in the different genera. Anterior maxillae with the palp bisetose; 
posterior maxillae normal. Branchial apparatus with the gill-elements much more 
fully developed in male than in female, and generally arranged along a spiral 
line; ends of the exopodal portions forming together a thin-skinned, protractile 
tube. 3rd pair of maxillipeds with the basal joint very much elongated and 
slightly dilated at the end, its outer corner carrying several long plumose set®, 
terminal part comparatively short. 1st pair of legs very slender, with the 3 outer 
6 — Crustacea. 
