POST-TERTIARY EOSSILIFEROUS DEPOSITS. 



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19. DUNTROON. 



This deposit occurs a little to the south of Duntroon Castle and comes to the surface 

 at about high-water-raark. By clearing away a slight covering of gravelly sand a stiff 

 brown clay is reached, containing many of the typical Arctic species of this series of 

 beds in abundance. 



Pleurotoma pi/ramidalis is particularly plentiful. 



The clay when dry imbibes the water very slowly, pieces from three to four inches 

 in diameter taking nearly twenty-four hours to dissolve ; nevertheless, it passes easily 

 through the sieve and washes rapidly, losing 83 per cent, in the operation. 



Height above the sea, just above high-water-mark. 



The following Ostracoda were found : 



ArgillcBcia ci/Iindrica, G. 0. Sars. 

 Pontoct/pris trigonella, G. O. Sars. 

 Cythere castanea, G. 0. Sars. 



— viridis, Miiller. 



— lufea, Miiller. 



— limicola (Norman). 



— pulchella, Brady. 



— villosa (G. 0. Sars). 



— concimm, Jones. 



— angulata (G. 0. Sars). 



— tuherculata (G. 0. Sars). 



— Bunehnensis (Norman). 

 Cytheridea papillosa. Bosquet. 



— punctillata, Brady. 

 Eucythere Argus (G. O. Sars). 

 Krithe Bartonensis (Jones). 

 Looooconcha impressa (Baird). 



— tamarindus (Jones). 

 Cytherura niyrescens (Baird). 



— simiHs, G. O. Sars. 



— pumila, n. sp. 



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