vi 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 me in 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. 



