V1 PREFACE. 
Scania: all these northern specimens have been of the greatest use to me in illustrating 
the British species. Having applied to Professor W. Dunker, of Cassel, for some of the 
species described by various German authors, he not only sent me many specimens out of 
his own collection, but procured from Messrs. Roemer, Koch, and Philippi, other specimens 
of great value; and to these most distinguished naturalists I beg to return my very 
sincere thanks. Lastly, I may be permitted to state, that I hope very soon to have 
another and more appropriate opportunity of publicly expressing my gratitude to various 
gentlemen, who for many months together have left in my hands their large and valuable 
collections of recent Cirripedia, and who have assisted mein every possible way. I will 
here only state, that it was owing to the suggestion and encouragement of Mr. J. E. Gray, 
of the British Museum, that I was first induced to take up the systematic description of 
the Cirripedia, having originally intended only to study their anatomy. To all the 
foregoing gentlemen, I shall ever feel under the deepest obligations. 
