POST-TERTIARY FOSSILIFEROUS DEPOSITS. 



67 



The following Ostracoda were found : 



Cythere lutea, Miiller. 



— concinna, Jones. 

 Cytheridea punctillata, Brady. 

 Cytherura gihba (Miiller). 

 Cytheropteron latissimum (Norman). 



— avgulatum, Brady and Robertson. 

 Sderochilus contortns (Norman). 



21. LucKNOw Pit, Ardeer Iron-works, Ayrshire. 



Although we could obtain no material from this pit to examine for Ostracoda, it is of 

 importance to record the section as illustrating the existence of a younger fossiliferous 

 l)ed (represented by the Peden maximus bed in the Kyles of Bute and the Irvine water 

 bed presently to be described) resting upon an older Arctic bed. 



The section obtained during the sinking of the pit was the following : 



Sand, about 

 Moss . 

 Sand . 



Shell-mud, or blue loamy sand 

 Blue clay 

 Sandstone rock . 



The shells brought to the surface belor 



12 ft. 0 in. 

 1 6 



26 0 

 6 0 

 6 0 



fFerent groups. The one 



iged to two entirely di 

 group was eminently Arctic, including Leda ardica, Astarte borealis, Tellina calcarea, 

 Natica affinis [dausa). 



The other group embraced a numerous collection of species precisely similar to those 

 found in the post-glacial bed in Irvine water. In this group Ostrea edulis is abundant 

 and associated with Cardium edule, C. Norveyicum, C. ediinatum. Topes pulladra, 

 T. decussata, Luiraria dlipitica, Peden opercularis, Trodius magnas. 



