Tab. 9. 



1. Margarita cinerea, Couth. 



2. Machæroplax varicosa, Migh. 



3. — albula, Gould. 



4. — beila, Verkriizen. 



5. — obscura, Couth, 



6. Margarita olivacea, Brown. 



7. Trochus occidentalis, Migh. 



8. Mølleria costulata, Møll. 



9. Littorina palliata, Say. 



10. — rudis, Maton; var. grønlandica. 



11. Hydrobia minuta, Totten. 

 12 Onoba aculeus. Gould. 



