POST-TERTIARY FOSSILIFEROUS DEPOSITS. 17 



Montaciifa elevata, an Arctic species, very rare in the glacial clays of Britain, also 

 occurs. The Ostracoda (of which we collected twenty-three species to be presently 

 enumerated) have much in common with those found in the clays on the east coast of 

 Scotland, which represent more strongly Arctic types than those generally found in the 

 west. Amongst these are — 



Ci/theropteron Montr osioise, nov. sp. 

 Cytheridea Sorhyana, Jones. 



Only one of these has yet been found in the glacial clays of the west of Scotland — 

 C. Montr osietisc, which we obtained at a depth of eighteen feet from a glacial clay, 

 dipping away from the Clyde, near Govan. C. Sorbyana is a common species in the 

 glacial clays of Norway. 



There is little doubt, however, that these species will be at some time found in a 

 western clay, just as we have found in a pit in Ayrshire a solitary specimen of Leda 

 arctica, which is the characteristic shell of the Errol clay on the west, but the fact of 

 their extreme rarity, to say the least, in the west and abundance in the east is full of 

 significance. 



Height above the sea 130 feet. 



The following Ostracoda were found : 



'o 



Cythere castanea, G. 0. Sars. 



— lutea, Miiller. 



— limicola (Norman). 



— glohulifcra, Brady. 



— concinna, Jones. 



— Dunelmensis (Norman). 

 Cytheridea papulosa, Bosquet. 



— Sorhyana, Jones. 

 Cyiherura niyrescens (Baird). 



— undata, G. 0. Sars. 



— dathrata, G. O. Sars. 

 Cytheropteron latissimum (Norman). 



■ — arcuatum, nov. sp. 



— Montrosiense, nov. sp. 

 Bythocythere constricta, G. O. Sars. 

 Sclerochilus contortus (Norman). 

 Paradoxostoma variabile (Baird). 



