227 



120. Cytheropteron punctatum, Brady. 



(PI. CV, fig. 1). 

 Cytheropteron punctatum, Brady, Mon. Brit. rec. Ostracoda, p. 449, PI. XXXIV, figs. 4548. 



Specific Characters. Female. Shell comparatively short and stout, with 

 the alaeform expansions well defined, but quite simple, seen laterally, suboval 

 in shape, greatest height in the middle and about equal to 2 /a of the length, 

 dorsal margin considerably arched, ventral scarcely at all sinuated, anterior 

 extremity somewhat produced and obtusely rounded off at the end, posterior 

 drawn out in the middle to a distinct obtusely conical protuberance defined 

 above by a well-marked sinus; seen dorsally, square-shaped in outline, with 

 the greatest width (between the tips of the alaeform expansions) somewhat 

 exceeding 2 /n of the length, anterior extremity gradually tapered to a sharp 

 point, posterior abruptly contracted and terminating in a conical prominence. 

 Valves with the alaeform expansions somewhat prominent, triangular in shape, 

 terminating behind in an obtuse-angular corner; surface of shell closely punc- 

 tate. Limbs scarely exhibiting any noticeable particularity in their structure. 



Male not observed. 



Colour of shell whitish, semipellucid. 



Length of adult female 0.45 mm. 



Remarks. This is a very small species and may, at the first sight, easily 

 be mistaken to be only the young of C. latissimum. It is however quite cer- 

 tainly distinct, differing conspicuously by the much more prominent alaeform 

 expansions, as also by the very distinct punctation of the valves. 



Occurrence. Two female specimens only of this form have as yet come 

 under my notice. They were found at Korshavn, south coast of Norway, at 

 a depth of about 30 fathoms, muddy sand. Norman has taken it also at 

 Sartor0, near Bergen. 



Distribution. British Isles, Fosse de Cap Breton, Bay of Biscay. 



121. Cytheropteron crassipinnatum, Brady & Norman, 



(PI. CV, fig. 2). 



Cytheropteron crassipinnatum, Brady & Norman, Mon. recent marine & freshwater 

 Ostracoda 1889, p. 212, PI. XX, figs. 16-18. 



Specific Characters. Female. Shell with the alaeform expansions con- 

 siderably produced, but without any apical or lateral spines, seen laterally, 

 oblong oval in shape, a little higher in front than behind, greatest height 

 somewhat exceeding half the length, dorsal margin rather arched in front and 



