212 



108. Cytherura lineata, Brady. 



(PI. XCVI1I, fig. 2). 

 Cytherura lineata, Brady, Mon. rec. Brit. Ostracoda, p. 441, PI. XXXII, figs. 30 3 J, 67. 



Specific Characters. Female. Shell, seen laterally, oblong oval in shape, 

 somewhat higher in front than behind, greatest height about equal to half the 

 length, dorsal margin gently arched throughout and sloping quite evenly to 

 the tip of the hind protuberance, ventral margin scarcely at all sinuated and 

 only slightly bowed behind, anterior extremity broadly rounded, posterior pro- 

 duced to a well-marked protuberance somewhat obliquely truncated at the tip 

 and located a little above the longitudinal axis of the shell; seen dorsally, 

 regularly oblong oval in outline, with the greatest width in the middle and 

 equal to half the length, side-edges evenly bowed, both extremities pointed, 

 the posterior somewhat more abruptly contracted than the anterior. Valves 

 rather thin and pellucid, surface marked with fainte longitudinal striae, which 

 are connected by transverse lines, thus forming a very distinct reticulate pattern 

 extending over the whole of the shell. There is however no trace of any 

 punctation, such as found in C. striata, its nearest ally. Both pairs of antennae 

 unusually short and stout, the anterior ones with the first 3 joints of the 

 terminal part of uniform length, last joint somewhat shorter. Posterior antennae 

 with the dividing suture of penultimate joint located exactly in the middle. 



Male not observed. 



Colour of the shell not yet ascertained. 



Length of adult female 0.45 mm. 



Remarks. I think I am right in identifying the above-described form with 

 that originally recorded by Brady, as it on the whole agrees pretty well with 

 the figures given in his Monograph. The author has however subsequently 

 (in 1889) withdrawn this species, supposing it to be founded only on young 

 specimens of his C. cornuta, a view which I am by no means prepared to 

 assent. It seems to me to be a well defined species, nearest allied to the 

 above described C. striata, from which it is however at once distinguished by 

 the very different shape of the shell, as seen dorsally. 



Occurrence. A solitary female specimen only of this form has as yet come 

 under my notice. It was found among some Ostracoda collected at Ris0r, 

 south coast of Norway, from depths of 10 20 fathoms. 



Distribution. British Isles. 



