108 BULLETIN OF THE NATURAL HISTORY SOCIETY. 
Chedabucto Bay and all around Cape Breton, abundant and ! 
very destructive. Also around entire coast of Nova Scotia, but 
much less abundant and not troublesome, Martin Murphy , 
[As the species of Teredo inhabiting our waters have not 
been well worked out, it is quite probable that there exists at 
the localities named above other species in addition to T. 
navalis. Indeed, Mr. Murphy, in the second of the papers 
quoted below, expressly states that either T. navalis or T. 
Norvagica exist all around the coast of Nova Scotia. It is 
greatly to be desired that a thorough study of our species 
should be made, and all are earnestly requested to assist in 
this work. Specimens from our waters, either of the animals 
preserved in alcohol, or of the wood containing their burrows 
and shells, would be of great value. They should be sent 
either to Mr. J. F. Whiteaves, of the Dominion Geological 
Survey, or to the writer. 
Teredo navalis prefers water warmer than that of the Bay 
of Fundy and the Atlantic coast; and hence we find it, though 
present, not at all troublesome in these waters. Its range, 
where destructive, on the other hand, is nearly coincident with 
that of the southern fauna of the Gulf of St. Lawrence. 
Mr. Murphy, in his admirable paper on the Teredo in Nova 
Scotia, cited below, misses the explanation of this fact. It 
is not because these waters are ice-bound in winter that it 
exists there, but because their warmer summer temperature 
affords more favorable conditions for the development of its 
young.] 
Habits. It is difficult to distinguish between the different species 
of Teredo, of which more than twenty are known, but the group or 
genus, as a whole, is easily recognizable. While differing somewhat in 
detail, their habits and structure are in general similar, and a description 
of one will answer with but few modifications for all. 
Teredo navalis is the best known of all of the species on account of 
its great damage to fixed and floating timber works in Europe, par- 
ticularly the dykes and docks of Holland. It is by no means certain 
that it is the most common species in Acadia, but beyond all question it 
does occur on the Gulf of St. Lawrence coast. 
In external appearance, the animal fully justifies its common name. 
But it is a true Mollusc, and a bivalve like the Clam. Though elongated 
and cylindrical, it shows no trace of constrictions. The anterior end, 
