THE ECONOMIC MOLLUSCA OF ACADIA. 
115 
The Preservation of Timber. By J. W. Putnam. Scientific 
American Supplement, Yol. X., No. 236, July 10th, 1880, 
3762-3763. 
Teredo. By J. T. Cunningham. Encyclopaedia Britannica, 
9th Ed., Vol. XXIII., 1888, pp, 184-186. 
The Teredo or Ship-worm. By B. E. C. Stearns. American 
Naturalist, Vol. XX., 1886, pp. 131-136. 
28. Teredo Norvagica Spengler. 
[Teredo, a borer ; Norvagica, 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 (Willis),” 
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 dorsalis. They probably 
cannot be distinguished by the untrained observer. This is a small 
8 
