32 ZOOLOGISCHE MEDEDEELIXGEX — DEEL I. 



IV. - PETRICOLA PHOLADIFORMIS LAM. ON THE DUTCH COAST. 

 BY Dr. J. H. VERNHOUT. 



Since I published my paper on this subject (Notes Ley den Museum. 

 Vol. XXXIV, 1912, p. 240). the following localities of our coast where 

 this American mollusc also has been collected, have come to my knowledge: 



Vlissingen, isle of Walcheren, south-east of Domburg (see sketch of 

 the coast of the Netherlands in the cited paper). 



Eastern-Schelde, between Ierseke and Tholen. 



Zand voort, between Noord wijk and Petten. 



Terschelling, the island next to Vlieland in nord-east direction. 



Leiden Museum. Jan. 7. 1915. 



