172 Stewart— Mollusca of the Boulder Clay. 



Cardium edule, Linn. 



Belfast Waterworks, Bryce. 



AST arte sulcata, Da Costa. 



Belfast Waterworks, Bryce ; Bangor, Castle-Espie, Knock, Waterworks, 

 Woodburn, Falls Park, S. A. S. This species and the following variety 

 are to be found in almost every Bed of Boulder Clay. Frequently the 

 shells are entire, but more commonly fragmentary. In the deposit at the 

 Waterworks it is especially abundant. 



ASTARTE SULCATA var. ELLIPTICA, Brown. 



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

 &c, S. A. S. 



ASTARTE COMPRESSA, Montagu. 



Belfast Waterworks, Bryce ; Bangor, Falls Park, Woodburn, S. A. S. 



ASTARTE COMPRESSA var. GLOBOSA, Moller. 

 Ballyrudder, Jeffreys and Hyndman. 



ASTARTE triangularis, Montagu. 



I found one specimen only in the Boulder Clay at the Falls Park. 



Astarte borealis, Chemnitz. 



Belfast Waterworks, G. C. Hyndman. 



Venus gallina, Linn. 



Belfast Waterworks, Bryce ; Bovevagh, County Derry, S. A. S. 



Venus ovata, Pennant. 



Belfast Waterworks, Bryce. 



Tapes aureus, Gmelin. 



Belfast Waterworks, Bryce. 



Tapes decussatus, Linn. 

 Belfast Waterworks, Bryce. 



