174 
Stewart — Mollusca of the Boulder Clay* 
Chiton marmoreus, Fabricius. 
Ballymdder, S. A. S. 
Emarginula fissura, Linn. 
Belfast Waterworks, Bryce. 
Trochus tumidus, Montagu. 
Belfast Waterworks, Bryce. 
Lacuna pallidula, Da Costa. 
Belfast Waterworks, Bryce. 
Lacuna divaricata, Babricius. 
Ballyrudder, S. A. S. 
Littorina litorea, Linn. 
Belfast Waterworks, Bryce. 
Turritella terebra, Linn. 
Belfast Waterworks, Bryce; Knock and Ballyrudder, S. A. S. ; Bovevagh, 
Co. Derry, Portlock. This is a rare shell in our Boulder Clay, except at 
Bovevagh, where I found it abundant in one spot, as recorded by General 
Portlock. 
Turritella erosa, Couthouy. 
Ballyrudder, Co. Antrim, Jeffreys and Hyndman. 
Natica Montacuti, Forbes. 
Ballyrudder, Co. Antrim, Jeffreys and Hyndman. 
Natica affinis, Gmelin. 
Belfast Waterworks, Bryce : Ballyrudder, S. A. S. 
Aporrhais pes-pelicani, Linn. 
Belfast Waterworks, Bryce. 
