83 



short. Anterior antennae rather slender, nearly attaining the length of the 

 cephalic segment, and composed of 8 well defined joints, the 2nd of which 

 is, as usual, the largest, though scarcely as long as the 2 succeeding joints 

 combined, the 4 outer joints, composing the terminal part of the antenna, of 

 about equal size. Posterior antennae comparatively small, with the outer ramus 

 poorly developed, bisetose. Oral parts of the stucture characteristic of the 

 genus. Natatory legs comparatively less slender than in the other species, and 

 coarsely aculeate outside, inner ramus reduced to a minute nodiform prominence 

 carrying in the 1st pair only one, in the other pairs 2 small bristles. Last 

 pair of legs with the distal joint of the usual narrow linear form, and provided 

 with 5 marginal setae, 3 apical and 2 lateral, the latter attached to the outer 

 edge beyond the middle; inner expansion of proximal joint produced to a 

 well defined narrow linguiform lamella carrying on the end 2 rather slender 

 and distinctly ciliated setae accompanied outside by a very small spinule. 



Colour brownish grey. 



Length of adult female 0.86 mm. 



Remarks. This new species is nearly allied to M. monensis, the 

 general form of the body being rather similar, though somewhat more robust. 

 It is however at once distinguished from that species by the absolute absence 

 of any dorsal process on the cephalic segment. The specific name here pro- 

 posed alludes to this want. As to the structural details, it moreover differs in 

 the distinctly 8-articulate anterior antennae and in the rudimentary condition 

 of the inner ramus of the natatory legs. 



Occurrence. Several specimens of this form, all of the female sex, 

 were found at Riser in depths ranging from 30 to 60 fathoms, coarse muddy sand. 



Gen. Eurycletodes, G. O. Sars. 



Remarks. Of this genus 4 species have been described in Vol. V of 

 the present work. To these are now added 4 others, increasing the number 

 of Norwegian species of this genus to 8 in all. 



68. Eurycletodes serratus, G. O. Sars, n. sp. 



(PL LVII). 



Specific Characters. Female. Body comparatively short and stout, of 

 nearly equal width throughout, with all the segments coarsely denticulate at 

 the hind edge. Cephalic segment scarcely as long as the 2 succeeding seg- 



