175 



very little transparent opaque shell. The form recorded by me in 1869 under 

 the name of Cy there propinqva is identical with the present species, and not, 

 as believed by Brady and Norman, with L. macallana. 



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

 Christiania Fjord, more frequently at Svelvik, entrance of the Drammen Fjord. 

 In the latter locality it occurred near the beach in slightly brackish water, and 

 its occurrence under similar conditions has also been stated by other authors. 



Distribution.- -British Isles, Holland. 



Fossil. Scotland. 



79. Lepiocythere tenera (Brady). 



(PI. LXXX, fig. 2.) 

 Cythere tenera, Brady, Monogr. Brit. Ostracoda, p. 399, PI. XXVIII, figs. 2932. 



Specific Characters. Female. Shell seen laterally, of a very narrow and 

 elongate shape, a little higher in front than behind, greatest height not nearly 

 attaining half the length, dorsal margin slightly arched in front and sloping 

 gently behind, ventral margin distinctly sinuated in the middle and curving 

 evenly upwards behind, anterior extremity weli rounded off, posterior narrowly 

 obtuse, with the upper corner scarcely projecting; seen dorsally, narrow oblong 

 in outline, with the greatest width rather less than l /3 of the length, both ex- 

 tremities obtusely pointed. Valves very thin and pellucid, almost destitute of 

 pittings and only marked with a few small tubercles, edges minutely hairy. 



Male. Shell only slightly differing in shape from that in the female. 

 Copulative appendages with the lappets of the terminal part but slightly pro- 

 duced, the posterior obtuse at the tip, the anterior pointed. 



Colour whitish pellucid. 



Length of adult female 0.45 mm. 



Remarks. This species may be easily distinguished from the 3 preceding 

 ones by the narrow and elongated shape of the shell, and by the very thin 

 and transparent valves. It is also of rather smaller size than any of them. 



Occurrence. A single female specimen of this form, that figured on the 

 accompanying plate, was taken, some years ago, at Risor, South coast of Nor- 

 way, in a depth of about 20 fathoms. Norman has recorded it also from 

 Drobak and from Lervik, Hardanger Fjord. Among some specimens kindly 

 forwarded to me by that author, mounted dry, I found a single male, and by 

 moistening this specimen, I succeeded in extracting from the shell the copulative 

 appendages in a condition perfect ennough to admit a closer examination. 



