33 



behind in the middle. Caudal rami about twice as long as they are broad 

 and not at all divergent, each having a well-marked keel along the dorsal face; 

 apical setae comparatively short. Anterior antennae very small, 5-articulate. 

 Posterior antennae considerably more slender than in the preceding species, 

 with the outer ramus scarcely half as long as the inner and only composed 

 of 2 joints, the proximal one very small. Mandibles and maxillae of about 

 same structure as in the preceding species. Anterior maxillipeds however rather 

 different, being much reduced in size and simple cylindric in form, with none 

 of the joints dilated. Posterior maxillipeds normally developed. Natatory legs 

 comparatively more slender than in the preceding species, and not exhibiting 

 any peculiarity in their structure. Last pair of legs comparatively large, with 

 the distal joint oval in form, its terminal lobes far less sharply marked off from 

 each other than in the preceding species and somewhat unequal, the outer- 

 most one being placed rather in front of the other 2; marginal setae moderately 

 slender, the innermost one the shortest and not spiniform; appendicular bristle 

 well developed and attached at a short distance from the base of the joint; 

 inner expansion of proximal joint rather narrow and extending somewhat 

 beyond the middle of the distal joint, outer apical seta much shorter than 

 the inner, which is attached somewhat more in front. 



Colour of the living animal not yet ascertained. 



Length of adult female, 0.78 mm. 



Remarks. The present form is especially distinguished by the peculiar 

 rudimentary condition of the anterior maxillipeds, a character by which it 

 differs from any of the other known species, and which indeed has given 

 rise to the specific name here proposed. It also exhibits some other well- 

 marked differences from the other species, as pointed out in the above 

 diagnosis. 



Occurrence. A solitary female specimen only of this distinct species 

 has hitherto come under my notice. It was found in a sample taken at Ris0r 

 in the same place as the preceding species. 



24. Pseudobradya scabriuscula, G. O. Sars, n. sp. 



(PI. XXI). 



Specific Characters. Female. Body moderately slender, with the 

 anterior division scarcely at all dilated in the middle. Cephalic segment slightly 

 exceeding in length the exposed part of the trunk, and gradually narrowed in front; 

 rostral plate somewhat prominent and obtusely pointed at the end. Urosome 



5. Crustacea. 



