209 



pointed, posterior abruptly contracted to a narrow conical prominence. Valves 

 of rather firm consistency and marked with distinct longitudinal striae or folds 

 partly connected with transverse lines, to form a somewhat irregular reticulation, 

 exhibiting moreover a well-marked punctation of the shell. Anterior antennas 

 with the joints of the terminal part not much differing in size, the last being 

 fully as long as the preceding one. Posterior antennae with the dividing suture 

 of the penultimate joint located a little above the middle. Legs rather slender, 

 the last pair with the 1st joint of the terminal part somewhat exceeding in 

 length the other 2 combined. 



Male of about same size as the female, but having the shell conspicu- 

 ously narrower, with the dorsal margin slightly concaved and the ventral more 

 deeply sinuated. Copulative appendages with the basal part obliquely oval 

 in shape and sending off below, at the junction with the terminal part, a 

 slender recurved piece somewhat elbowed in the middle, and more posteriorly 

 another much smaller deflexed process; copulatory string excessively prolonged, 

 forming and ample turn and thence ascending to the very dorsal face; terminal 

 part irregularly triangular in shape, projecting at the end anteriorly in a beak- 

 like deflexed corner, behind which are 2 successive rounded lobules. 



Colour of shell light orange, somewhat darker in front, 



Length of adult female 0.49 mm. 



Remarks. The present species is easily recognised from those described 

 in the preceding pages by the comparatively large size of the protuberance 

 terminating the shell behind and by the situation of this protuberance below 

 the longitudinal axis of the shell. The specific name alludes to another parti- 

 cularity, viz., to the rather strongly marked longitudinal striae or folds adorning 

 the surface of the valves. When examined in the fresh state it is also well 

 disitnguished by the light orange colour of the shell. 



Occurrence. I have taken this form occasionally in the upper part of the 

 Christiania Fiord in depths of 10 to 20 fathoms, and have also met with it in 

 several other places, both of the south and west coasts of Norway. 



Distribution. British Isles, Holland, Mediterranean. 



Fossil Norway, Scotland. 



106. Cytherura producta, Brady. 



(PI. XCVII, fig. 2). 

 Cytherura producta, Brady, Mon. recent British Ostracoda, p. 443, PI. XXXII, figs. 60, 61. 



Specific Characters. Female. Shell rather tumid, seen laterally, narrow 

 oblong oval in shape, somewhat higher in front than behind, greatest height 



26 Crustacea. 



