PLATE ly* 
1. Trophon scalariformis, Go^ild. 
2. atica islandica, Gmel. 
3. Natica clausa, Bi'od. ^ Sow. 
4. Cancellaria viridula, Fab. 
5. Pleurotoma pyramidalis, Strom. 
6. Yelutina undata, J. Smith. 
7. Scalaria groenlandica, Ghemn. 
8. Tellina calcaria, Ghemn. ( = T. lata, Gmel.) 
9. Cardium groenlandicum, Ghemn. 
10. Astarte borealis, Ghemn. 
11. Astarte sulcata, Da Gosta. 
12. Astarte compressa, Mont. 
13. Leda lanceolata, J. Sow. {a. inside, h. outside.) 
14. Ehyncbonella psittacea, Ghemn. {a. side view of the exterior of 
both valves, b. interior.) 
