THE ECONOMIC MOLLUSCA OF ACADIA. 23 



S. As fertilizers. See Ostrea Vlrg'miana. 



Mytilus edulis. 



Modiola plicatula. 



Omrnastrephes illecebrosa. 



Loligo Pealei. 

 •4. For ornaments, including pearl. 



See Margaritana. 



Vetnts mercenaria. 



MytiliLS edulis. 



Modiola modiolus. 



Cardium Mandicum. 



Peden tenuicostatus. 



Madt a solidissima. 



JBiicci7ium undatum, 



Fiisiis Idandiais. 



Fusus decemcostatits, 



5. For money. See Venus mercenaria. 



•6. For dyes. See Purpura lapillus, 



Buccinum undatum. 



7. For dishes and minor uses. 



See Ostrea Virginiana. 

 Peden tenuicostatus. 

 Madra solidissima. 

 Mytilus edulis. 



(b) Indirectly useful. 

 •(1) As food for fishes. See Introduction of this paper, p. 15. 



(2) Protection of coasts from erosion, etc. 



See Mytilus edulis. 



Modiola modiolus. 



(3) Removal of wrecks and obstructions to navigation. 



See Teredo navalis. 



(4) Of value to oyster beds. See Liitorina litorea. 



Injurious Mollusca. 



(a) Directly injurious. 



1. Destructive to sub-marine timber. 



See Teredo navalis. 

 Teredo norvagica. 

 Teredo dilatata. 

 Xyhphaga dorsalis. 



