PLATE XX. 



Pig. 



1. Sipho islandlcufi (Chemnitz). Recent, Vardo. (Harmer Collection) 



2. Ditto. Ijittle Oakley. (Harmer Collection) 



3. Siplu) (jracilis (Da Costa). Recent, Lynn deeps. (Harmer Collection) 



4. Ditto. Little Oakley. (Harmer Collection) 



5. var. Goulsoni, Jordan. Little Oakley. (Harmer Collection) 



6. ditto. Recent. (Tomlin Collection) 



7. var. elongata, nov. Boyton. (Harmer Collection) 



8. Siplio propinquus (Alder). Recent, Dogger Bank. (Harmer Collection) 



9. Ditto. Little Oakley. (Harmer Collection) 



10. Slpjho latericeus (Moller). Uddevalla. (Harmer Collection) . 



11. Ditto. Recent. (Harmer Collection) 



12. Ditto. Little Oakley. (Harmer Collection) 



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