POST-TERTIARY FOSSILIFEROUS DEPOSITS. 37 



CytUere lutea, Miiller. 



— villosa (G. 0. Sars). 



— concinna, Jones. 



• — Dunelmensis (Norman). 

 Cytheridea punctillata, Brady. 

 Cythenira 'nigresceriH (Baird). 

 — undata, G. 0. Sars. 



7. Old Mains, Renfrew. 



In a cutting for a tramway, between the Houston Pit No. 5 and the farm of Old 

 Mains, a bed of shells of arctic character is exposed. The cutting is from six to seven 

 feet at the highest point, and the bed of shells stretches along the section for about 

 twenty yards, cropping out towards the farm and dipping towards the River Cart, 

 The thickest part of the shell-stratum exposed is from eighteen to twenty inches ; but 

 the cutting appears only to have touched the edge of the shell-bed, as it is not seen on 

 the opposite bank. 



The deposit is made up of brown sand and earth crowded with stones, many of them 

 covered with Balani. Sand predominates in the shell-stratum. Mytilus modiolus^ 

 Saxicava niyosa, Astarte sulcata, and Axinus Jlexuoms we found with united valves. 

 Such species as Pecten Idandiciis, Tellina calcarea, Trochus Grmilandicus, T. twmidus, 

 Natica affinis, N. Groinlandica, Velidina zonata, Pleurotoma violacea, Buccinum 

 Grcenlandicum, also occur. 



Height above the sea thirty feet. 



The following Ostracoda were found : 



Cy there peUucida, Baird. 



— castanea, G. 0. Sars. 



— concinna, Jones. 

 . — viridis, Miiller. 



— lutea, Miiller. 



— villosa (G. O. Sars). 



— anyulata (G. 0. Sars). 



— tuherculata (G. 0. Sars). 



— Dunelmensis (Norman). 

 Cytheridea papulosa. Bosquet. 



