THE ECONOMIC MOLLUSCA OP ACADIA. 115 



The Preservation of Timber. By J. W. Putnam. Scientific 



American Supplement, Vol. X., No. 236, July 10th, 1880^ 



3762-3768. 

 Teredo. By J. T. Cunningham. Encyclopaedia Britannica, 



9th Ed., Vol. XXIII., 1888, pp. 184-186. 

 The Teredo or Ship-worm. By R. E. C. Stearns. American 



Naturalist, Vol. XX., 1886, pp. 131-136. 



28. Teredo ^'orvagica Spengler. 



[Teredo, a borer ; Korvayica, inhabiting Norway.] 



Ship-Worm. 



Distribution, {a) General; — Cape Cod northward 

 North European Seas. 



(b) In Acadia; — " Marine slip timbers at Pictou. 

 (Whiteaves)," Jones. Further distribution not known. As 

 stated under T. navalis, much or most of the damage attributed 

 to that species may be due to this. 



Habits. In general similar to Teredo navalis. It would be extremely 

 difficult for the untrained observer to distinguish them. Specimens 

 should be sent to some special student of Mollusca. 



Economics, Similar to T. navalis. 

 29 Teredo dilatata Stimpson. 



[Teredo, a borer ; dilatata, swollen.] 



Distribution. {a) General-, — South Carolina to Cape 

 Ann. Sable Island. 



{b) In Acadia; — " Very large specimens have been received 

 from Sable Island, taken from wrecked timbers (Willip)," 

 Jones. 



[There is a possibility that this species may be the follow- 

 ing, but it is unlikely. It is a southern species, but many 

 such occur on Sable Island.] 



Habits. In general similar to Xylophaga dormlis. They probably 

 cannot be distinguished by the untrained observer. This is a small 



