RECENT BRITISH OSTRACODA. 



Up- 



front, mucronate behind. Shell smooth or indistinctly reticulated. Central areola obso- 

 lete (" as in C. nigrescens" Sars). 

 Length -jj in. 



Hab. In shell-sand from the River Ribble (Mr. E. C. Davison) and amongst oyster-ooze from Stranraer 

 (G. S. B.), one specimen from each locality; Shetland (Mr. D. Robertson). 



8. Cytherura undata, G. 0. Sars. (Plate XXXII. figs. 43-49, 66.) 



Cytherura undata, G. O. Sars, loc. cit. p. 75. 



humilis, Brady, Brit. Assoc. Report, 1866, p. 210. 



Scandinavian type ? Distribution: Recent — Baffin's Bay, Norway, Great Britain, Ireland. Fossil 

 Glacial, Scotland, Ireland, Norway. 



Carapace of the female, as seen from the side, subrhomboidal ; greatest height equal to 

 rather more than half the length. Anterior extremity obliquely rounded, posterior ob- 

 liquely truncate, and forming a very short projection above; superior mar-in arched, 

 inferior scarcely sinuated, and forming a distinct angle behind. Outline, as seen from 

 above, oblong, nearly parallel-sided, almost rectangular behind ; width equal to less than 

 half the length. The male rather more elongated. SheU thick and strong, indistinctly 

 reticulated, and marked with irregular crests or ribs, two or three of which usually run 

 directly forward from a transverse ridge in front of the middle of the valve, thus pro- 

 ducing the outline of the letter F. The surface-markings are usually more prominent in 



-< 



male than in the female. Colour yellowish 

 Length A- in. 



-UCIlgtll $■£ in. 



Hab. Birterbny Bay, 10 fathoms, and in oyster-ooze from Stranraer (G. S. B.) ; Shetland, Cumbrac. 

 M,^# La ri_ }ia. n nnh**™* : the Minch (Mr. J. G. Jeffreys) ; Stornoway, and in rock- 



N.B. (Rev. A. M. Norman 



9. Cytherura producta, n. sp. (Plate XXXII. figs. 60, CI.) 



Valves of the male, as seen from the side, oblong, produced into a rounded laterally 

 projecting ala ; height equal to less than half the length. Anterior margin t*M, 

 obliquely truncate belowfposterior produced in the middle into a long taper,, « ^ngu • 

 >>eak; superior and inferior margins nearly straight in the , nnddle, the "J**"" 

 nearlv a rirtt «h h«hind. Outline, as seen from above, broadly ovate, w,dest , 



rly a right angle behind 



Surface 



Central areola broad, somewhat crescentic. Ltiejemate 



and polished, without any sculpt 

 Length A in. 



G vii 5 



M. Norman) ; off Orm head (Jfi 



• »»* nnlv havin^ been met with from the first 

 pecies, three specimens onlj na\ m 



J —J 7 



Robertson). 



Apparently a scarce I 

 named, and one from the second locality 



10. Cytherura affinis, G. O. Sars. (Plate XXXIL figs. 19-21 



Cytherura affinis, G. O. Sars, loc. cit. p. 77. 



3o2 



