41 



Remarks. This form is very easily recognizable from our other Cumacea 

 by its short, club-shaped body, and, indeed, its form appeared to Kr0yer so 

 unusual that he applied to it the specific name dcformis (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 Dr. 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 off the Jsederen 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 (VerrilK 



Fam. 5. Diastylidae. 



Characters. Body, as a rule, not very slender, with the anterior division 

 more or less tumefied, and sharply marked off 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 maxilla? with the palp biseto.se; 

 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 setae, 

 terminal part comparatively short. 1st pair of legs very slender, with the 3 outer 



G Crustacea. 



