PLATE VJ . 



1 



1. Pry of 7? 2.3. Ditto laaonitied. 



4i. Saxicava arctica.. 5.6. Ditto magnified. 



7.8. S.ruoosa. 9.10. Eetricola lithophaga. 



Xcrndci->v. TicHisTi^ed iy Jbhrt Vb-n, Voorst. 1S4&. 



