364 



medial one almost attaining the length of the body. Anterior antennae ra 

 slender and attenuated, 9-articulate. 4th joint exceeding in length the 3rd, terminal 

 part not attaining half the length of the proximal one. Posterior antennae of the 

 usual^structure. Posterior maxillipeds not nearly so powerful as in H. chelifer, hand 

 oval in form, with the palmar edge obtusely angular in front of the middle, dactyl us 

 rather slender. 1st pair of legs with the rami narrower than in H. chelifer and the 

 apical claws less strong, distal joint of outer ramus shorter than the proximal one, 

 inner ramus extending considerably beyond the latter. Natatory legs of the usual 

 structure. Last pair of legs with the distal joint rounded oval in form, and somewhat 

 constricted at the base, marginal setse comparatively slender; inner expansion of 

 proximal joint rather broad, extending somewhat beyond the middle of the distal 

 joint, and almost tranversely truncated at the end, which carries 4 unequal setae 

 similar to those in H. gracilis. Ovisac comparatively small. 



Male exhibiting the usual sexual differences from the female. Anterior 

 antennae distinctly hinged, though having the last joint of the proximal part far 

 less tumefied than in the male of H. chelifer. Inner ramus of 2nd pair of legs 

 with the mucronate process of the middle joint comparatively shorter than in 

 that species. Outer ramus of 3rd pair less powerful and scarcely incurved, more 

 resembling that in the male of H. uniremis. Last pair of legs with the distal 

 joint oval in form, carrying 5 moderately slender setse; inner expansion of prox- 

 imal joint obsolete. 



Colour yellowish brown. 



Length of adult female 97 mm. 



Remarks. The above-described form is unquestionably that recorded in 

 Prof. Brady's Monograph at H. chelifer. It is, however, not identical with Miil- 

 ler's species, which is described in the present work on page 49; but more 

 nearly related to H. gracilis Glaus, from which it is, however, at once distinguished 

 by its much larger size. 



Occurrence. I have met with this form in several places, both on th 

 south and west coasts of Norway. It is a pronouncedly littoral species, being 

 generally found in very shallow water, especially in flat sandy creeks ; and it 

 is not seldom left in tidal pools together with other littoral species. 



Distribution, British Isles (Brady). 



Page 57. 

 Zaus spinatus, Goodsir. 



Distribution -Polar islands north W Urinnell Land (2nd Fram Kxp 



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