

PLATE II. 



Diagrammatic Enlargements of the Hinges of ; 



1. Pisidium pulcliellum. 



2. vincentianum. 



3. subtruncatum. 



4. henslowaniun. 



5. supinum. 



6. parvulum. 



7. steenbuchii. 



8. littjeborgii. 



9. hibernicum. 



10. obtusale. 



In the above Plate the white dots are placed opposite the 

 apices of the inner lateral teeth. 



