sion by the Trustees, the public
collection would have been of no use to me, or to any other naturalist,
in systematically classifying the Cirripedes.

Previously to Mr. Gray suggesting to me the present Monograph, Mr.
Stutchbury, of Bristol, had offered to intrust to me his truly beautiful
collection, the fruit of many years' labour. At that time I refused this
most generous offer, intending to confine myself to anatomical
observations; but I have since accepted it, and still have the entire
splendid collection for my free use. Mr. Stutchbury, with unwearied
kindness, further supplied me with fresh specimens for dissection, and
with much valuable information. At about the same period, Mr. Cuming
strongly urged me to take up the subject, and his advice had more weight
with me than that of almost any other person. He placed his whole
magnificent collection at my disposal, and urged me to treat it as if it
were my own: whenever I told him that I thought it necessary, he
permitted me to open unique specimens of great value, and dissect the
included animal. I shall always feel deeply honoured by the confidence
reposed in me by Mr. Cuming and Mr. Stutchbury.

I lie under obligations to so many naturalists, that I am, in truth, at
a loss how to express my gratitude. Mr. Peach, over and over again, sent
me fresh specimens of several species, and more especially of
_Scalpellum vulgare_, which were of invaluable assistance to me in
making out the singular sexual relations in that species. Mr. Peach,
furthermore, made for me observations on several living individuals. Mr.
W. Thompson, the distinguished Natural Historian of Ireland, has sent me
the finest collection of British species, and their varieties, which I
have seen, together with many very valuable MS. observations, and the
results of experiments. Prof. Owen procured for me the loan of some very
interesting specimens in the College of Surgeons, and has always given
me his invaluable advice and opinion, when consulted by me. Professor E.
Forbes has been, as usual, most kind in obtaining for me specimens and
information of all kinds. To the Rev. R. T. Lowe I am indebted for his
particularly interesting collection of Cirripedes from the Island of
Madeira--a collection offering a singular proof what treasures skill and
industry can discover in the most confined locality. The well-known
conchologist, Mr. J. G. Jeffreys, has sent for my examination a very
fine collection of Br