112 VENUS MERCENARIA. 
for while the conditions, under which the second deposit was 
made, were on the whole more favourable to the colony, so 
that some did struggle through an existence for two or three 
years, yet there is no ground for supposing that any now exist in 
the waters around Hilbre Island. The mistake would appear 
to have been in treating the Clam as a marine species, instead 
of an inhabitant of brackish water. 
It may be of interest here to mention that, thanks to 
Mr. Moore of Liverpool, another and we may hope a more 
successful attempt to introduce the Clam was made last summer. 
This time our own river, the Dee, has been selected for the 
experiment. Some hundreds of thesé popular mollusks are, we 
may hope, thriving and multiplying in the more brackish waters 
of the Dee. 
It is scarcely desirable to mention the spots where they are 
placed. It will be sufficient to say that they are between the 
White House in the upper waters of the Dee, and Connah’s 
Quay. They have also been laid down near Bagillt, at 
the mouth of the Clwyd, and at Colwyn Bay. If the Clam 
can be successfully cultivated in our tidal streams, there is 
very little doubt but that it will prove a formidable rival of our 
Ostrea edulis. 
Specimens of the shell may be seen in our Museum. 
