43 



POST-TERTIARY ENTOMOSTRACA. 



JEiicythere Argus (G. 0. Sars). 

 Loxoconcha tamarindus (Jones). 

 Cytherura similis, G. 0. Sars. 



nigrescens (Baird). 



— undata, G. 0. Sars. / 



— clathrata, G. O. Sars. 

 Cytheropteron latissimum (Norman). 



— angulatum, Brady and Robertson. 

 Bythocythere constrida, G. 0. Sars. 

 Sclerochilus contortus (Norman). 

 Paradoxostoma variahile (Baird). 



— tenerum, n. sp. 



Folycojie orbicularis, G. 0. Sars. 



10. Loch Lomond. 



On the shore of the little island of Inchlonaig, in dry seasons when the water of the 

 lake is very low, a bed of dark grey clay is exposed, thickly interspersed with shells^ 

 amongst which are Tellina ccdcarea, Feden Islandicus, Leda pernula, L. jjygmoea^ Trodms 

 Groenlandiciis, and Pleurotoma pyramidalis, species which sufficiently establish the general 

 arctic character of the deposit. 



The same clay has also been found in the banks of a small burn to the north of the 

 Pass of Balm aha. 



A shell-bed of a more recent character occurs on the Loch side, in a little creek at 

 Rossaden, near Luss, which must not be confounded with this older arctic clay. It is 

 one to two feet under the ordinary level of the Loch. The clay is of a whitish colour, 

 and has a strong peaty smell. It is very pure, containing only a small percentage of 

 sand. The shells are abundant, but exceedingly friable. Mytilus edulis and Hydrohia 

 nlva are the most abundant ; Littorina is moderately common ; and Tellium Balthica 

 is represented by a few valves. All these species can endure a certain admixture of fresh 

 water with the sea. A few Foraminifera occur of similar habitat, but no Ostracoda. 



Height above the sea twenty feet. 



In the glacial clay of Inchlonaig the following Ostracoda were found : 



Cythere pellucida, Baird. 

 — viridis, Miiller. 



