Stewart— Mollusca of the Boulder Clay. 173 



Tellina balthica, Linn. 



Belfast Waterworks, Bryce ; Ballyrudder, Jeffreys and Hyndman ; Falls 

 Park, S. A. S. 



Tellina calcarea, Chemnitz. 



Belfast Waterworks, G. C. Hyndman ; Ballyrudder, Jeffreys and 

 Hyndman. 



Mactra substruncta, Da Costa. 



Belfast Waterworks, G. C. Hyndman ; Ballyrudder, Jeffreys and Hynd- 

 man, also S. A. S. 



Mactra solida var. truncata, Montagu. 

 Belfast Waterworks, Bryce. 



Mactra Solida var. elliptica, Brown. 

 Belfast Waterworks, Bryce. 



SCROBICULARIA PIPERATA, BellonitlS. 



Belfast Waterworks, Bryce. 



MYA truncata, Linn. 



Belfast Waterworks, S. A. S. 



Saxicava rugosa, Linn. 



Belfast Waterworks, Bryce. 



Saxicava rugosa var. arctica, Linn. 



Falls Park, Waterworks, Woodburn, Ballyrudder, S. A. S. 



Pholas parva, Pennant, 



Ballyrudder, County Antrim, where I found one specimen. It is men- 

 tioned by Jeffreys as occurring in the Red crag, which is the only other 

 British deposit in which it is found fossil, so far as I know. 



Pholas crispata, Linn. 



Belfast Waterworks, fragments only, Bryce. 



