CYTHERE. 157 



22. Cythere pulchella, Brady. Plate III, figs. 29 — 37. 



1868. Cythere pulchella, Brady. Monog. Rec. Brit. Ostrac, p. 404; Ann. Mag. 



N. H., ser. iv, vol. ii, p. 32, pi. v, figs> 18 — 28. 



1869. — — Brady and Robertson. Ann. Mag. N. H., ser, iv, 



vol. iii, p. 369, pi. xx, 

 figs. 1—3. 



Carapace of the female, as seen from the side, oblong, subquadrangular, highest at 

 the anterior third, greatest height equal to more than half the length; anterior extremity 

 broad and well rounded ; posterior narrower and obliquely subtruncate; superior margin 

 slightly arched, sloping from before backwards ; inferior sinuated in front of the middle. 

 Outline, as seen from above, ovate, widest in the middle, greatest width equal to less 

 than half the length, extremities obtusely pointed. End-view broadly ovate. The shell 

 of the male (fig. 33) is more elongated and angular in outline. Surface covered with 

 closely set, small, circular impressions, and marked mostly towards the anterior and 

 posterior margins with faintly waved grooves or rugse. Lucid spots numerous (fig. 36), 

 small, forming an irregular group near the centre of the valves. Hinge-processes of the 

 right valve distinctly crenated (fig. 35). 



This species is very similar in shape and general appearance to C. villosa, but is 

 smaller, more delicately sculptured, and less angular in outline ; the hingement and 

 characters of the lucid spots are also widely different. In the recent state it has 

 been found (but sparingly) in the Arctic seas, the west of Ireland, north-west of Scotland, 

 and Holland. 



Distribution. Becent. — Baffin's Bay, Scotland, Ireland, Holland. 



Fossil. — Scotland : Duntroon, Loch Gilp, Kilchattan, Dumbarton. Ireland : 

 Woodburn. 



23. Cythere villosa {G. 0. Sars). Plate III, figs. 7—13. 



1865. Cytheeeis villosa, G. O. Sars. Overs. Norg. mar. Ostrac, p. 42. 



1868. Cythere — Brady. Monog. Rec. Brit. Ostrac, p. 411, pi. xxix, 



figs. 28—32. 



Carapace of \hQfemaoe, as seen from the side, subreniform, highest in the middle, 

 greatest height equal to more than half the length. Anterior extremity obliquely rounded ; 

 posterior obliquely truncate and sinuated ; dorsal margin evenly arched, ventral sinuated 

 in front and forming a subangular projection behind the middle. Outline, as seen from 



