CYTHERE. ! 147 



with irregularly waved depressions, the separations between which sometimes rise 

 into well marked ridges. 



Length, ^^^d of an inch. 



This species is, in many respects, not unlike C. 5adia, Norman, with which, indeed, 

 it was confounded in the ' Monograph of the Recent British Ostracoda.' It is, 

 however, distinctly truncate behind, and is usually conspicuously sculptured, or even 

 rugose, with the anterior border minutely crenated. C. hadia, on the contrary, is but 

 vaguely pitted on the surface, and, seen from above, is pretty regularly ovate and not at 

 all truncate. The Mediterranean form described by Mr. Brady {pp. cit.) under the 

 specific name crispata, though much more prominently rugose, seems to be essentially 

 the same as the northern species. The name cicatricosa having been previously applied 

 by Reuss to another species of the same genus, must give way to that here adopted. 



Distribution. Recent. — Great Britain, Ireland, Norway, Mediterranean, (?) 

 Australia, Hong Kong. 



Fossil. — Scotland : Cumbrae. Ireland : Portrush. Norway -. Post-tertiary beds. 



8. Cythere viridis, Miiller. Plate III, figs. 36 — 28. 



1785. Cythere viridis, Miiller. Entomostraca, p. 64, tab. vii, figs. 1, 2. 

 1865. — — G. O. Sars. Oversigt af Norges marine Ostracoder, p. 30. 

 1868. — — Brady. Monog. Recent Brit. Ostrac, p. 397, pi. xxviii, 



figs. 40, 41, 57 — 59, and pi. xxxviii, fig. 8. 



Carapace of the female as seen from the side subreniform, rather higher in front than 

 behind, greatest height equal to more than half the length. Extremities well rounded ; 

 superior margin nearly straight, inferior deeply sinuated in the middle. Outline as seen 

 from above oblong ovate, pointed in front, greatest width situated in the middle, scarcely 

 equal to half the length ; end view ovate. Shell of the male more elongated. Surface 

 smooth, marked with small distant punctures. 

 Length -^g-th of an inch. 



C. viridis is common in the recent state on our coasts, living mostly between tide-marks, 

 but also in moderate depths of water down to 20 — 30 fathoms. 



Distribution. Recent. — Norway, Great Britain, Ireland, Holland. 



Fossil. — In most of the clay beds in the Clyde district, rarer in the east of 

 Scotland ; Portrush, Ireland. Norway, Post-tertiary beds. 



