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cumstance occurred under my own observation, 
at the mouth of the Guadalquiver, near Cadiz; 
where, after a gale of wind, and at ebb tide, a 
reef of bivalves was left, several feet high, and 
above a mile in length, from whence [I select- 
ed many fine varieties. Indeed, almost every 
gale of wind throws up some interesting shells. 
From the interior, near Santa Cruz, from Isle 
Grande, Sebastian, Porcos, and that Archipe- 
lago, also along the coast to Bertiojo and San- 
tos, I collected many curious shells; but, 
strange to tell, I have found it difficult to per- 
suade any one to send me another supply, al- 
though they may so easily be obtained. No, 
they think them common, and because they 
really are so there, they do not bring or send 
them. We know nothing of the shells pro- 
duced along this coast, more than that they are 
in request for the table. The low land about 
