CYTHERIDEA. 177 



papulosa ; and though the British specimens, both recent and fossil, are considerably larger 

 than those obligingly sent to us from France by M. Bosquet, they so perfectly agree in every 

 other respect that we can scarcely do otherwise than adopt the name papillosa already 

 applied to them by Mr. Brady. In habitat it ranges from extreme low-water-mark to 

 twenty or thirty fathoms, and is also found, but much less abundantly, in greater depths 

 of water. 



Distribution. Recent. — Baffin's Bay, Gulf of St. Lawrence, Norway, Spitzbergen, 

 Great Britain. 



Fossil. — England : Bridlington. Scotland : nearly all the Post-tertiary beds, Norway 

 and Canada : Post-tertiary beds. France : Tertiary. 



2. Cytheridea punctillata, Brady. Plate VI, figs. 1 — 11. 



1865. Cytheridea punctillata, Brady. Ann. Mag. Nat. Hist., ser. iii, vol. xvi, 



p. 189, pi. ix, figs. 9—11. 1868, 

 Monog. Brit. Ostrac, p. 424, pi. xxvi, 

 figs. 35—38; pi. xxviii, figs. 17—20. 



1865. Cyprideis proxima, G. 0. Sars. Overs. Norg. mar. Ostrac, p. 54. 



Carapace of the female, as seen from the side, subovate, highest in front of the middle, 

 greatest height equal to more than half the length. Anterior extremity broadly and 

 evenly, posterior somewhat obliquely rounded ; superior margin highest over the anterior 

 hinge, where it is obscurely angular, thence sloping backwards with a gentle convexity ; 

 inferior straight or very slightly sinuated in the middle. Outline, as seen from above, 

 ovate, greatest width in the middle, and equal to half the length ; extremities obtusely 

 pointed ; end-view nearly circular. The carapace of the male (tig. 4) is much longer, 

 narrower, and more angular, the posterior margin of the right valve sloping abruptly in a 

 subtruncate manner. Surface of the shell thickly covered with impressed puncta, which 

 have a tendency to coalesce or to form faintly-marked grooves. Specimens from certain 

 localities (Jordan Hill, &c.) bear also numerous small circular elevated papillse ; in young 

 specimens these constitute the only markings, but are displaced by the pitted sculpture 

 as age advances. Many examples are profusely marked with both species of sculpture. 

 Colour yellowish-brown . 



Length, ^th of an inch. 



Cytheridea punctillata occurs in the living state on the shores of Britain and Norway 

 in company with the preceding species, but is not nearly so common, nor is its range of 

 habitat so great ; it does not seem to approach nearer to the shore than depths of 15 — 

 20 fathoms. In the Glacial clays, however, it is much more abundant, being, perhaps, 

 the commonest of all the Ostracoda in those formations. It may readily be distinguished 



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