162 



the following year replaced by Brady with that of Eucythere. The genus 

 presents some characters in common with Cytheridea, yet differing conspicu- 

 ously in the shape and thin consistency of the shell, as also in some of the 

 other structural details. The extraordinary development of the brush-like male 

 appendages is a character quite peculiar to the present genus and scarcely 

 found in any other of the Cytheridse. Another character by which this genus 

 differs from the other genera comprised within the present subfamily is the 

 want of any transformation of the legs in the male sex. The genus as yet 

 only comprises the 2 species described below. 



71. Eucythere argus, G. O Sars. 



(PI. LXXV, fig. 1). 

 Cytheropsis argus, G. O. Sars, Oversigt af Norges marine Ostracoder, p. 58. 



Specific Characters. Female. Shell, seen laterally, oblong triangular in 

 shape, greatest height somewhat in front of the middle and not fully attaining 

 half the length, dorsal margin strongly arched in the middle and sloping 

 gradually to each extremity, more steeply behind, ventral margin slightly 

 sinuated, anterior extremity broadly rounded, posterior much narrower and 

 blunted at the end; seen dorsally, oblong ovate in outline, greatest width far 

 behind and about equal to the height, anterior extremity tapering to an acute 

 point, posterior much broader and obtuse at the end. Surface of shell adorned 

 with a number of very large and conspicuous rounded tubercles or papillae of 

 an opaque whitish colour, and clothed at each extremity with scattered fin 

 hairs. Anterior antennae with the distal segment of the basal part unusuall 

 prolonged, exceeding in length the terminal part, last joint of the latter abou 

 half the length of the middle one. Posterior antennae with the terminal join 

 comparatively large, apical claws rather unequal, the posterior much shorte 

 and thinner than the anterior, which is distinctly denticulated at the end i 

 front. Vibratory plate of mandibular palp with 2 setae only. Maxillae with th 

 innermost masticatory lobe unisetose, distal joint of palp about as long as th 

 proximal one. Legs only slightly increasing in length posteriorly, seta on th 

 anterior edge of the basal part rather coarse and curving slightly upwards. 



Male. Shell much more elongate than in female, with the dorsal margi 

 more evenly curved, and the posterior extremity more narrowly produced. 

 Colour of shell not jet ascertained. 



Length of adult female 0.61 mm., of male 0.64 mm. 



Remarks. The present species is easily recognised by the very large an 

 conspicuous opaque white papillae adorning the surface of the shell, and indee 



; 



