PREFACE. 



I HAVE great pleasure in returning my most sincere thanks to various naturalists, 

 both for intrusting to me their collections of Fossil Cirripedia, and for allowing me, 

 whenever it was advisable, to clear the specimens from their matrix. Although an entire 

 stranger to many of the gentlemen to whom I applied, I have in every instance received 

 the most courteous acquiescence to my demands. To Mr, Fitch, of Norwich, I here beg 

 to return ray thanks, for having allowed me to keep, during several months, his unrivalled 

 collection of Cirripedia from the Upper Chalk of Norwich, — the fruit of twenty years' 

 labour. Mr. Bowerbank has given me the freest use of his fine collection, rich in 

 specimens from the Gault. Mr. Wetherell placed in my hands his beautiful and unique 

 specimen of Loricula pulcheUa, and other species. Professor Buckman sent me, of his 

 own accord, a fiine series of the valves of PolHcipes oolUicus, the most ancient Cirripede 

 as yet known, discovered and named by him. To Messrs. Flower, Searles Wood, 

 F. Edwards, Harris, S. Woodward, Tennant, and other gentlemen, I owe the examination 

 of several species new to me. Mr. Morris and Professor E. Forbes have, in their usual 

 kind manner, supplied me with much valuable information, and with the loan of many 

 specimens. To Mr. James de C. Sowerby I must express my thanks for the valuable aid 

 rendered to me by the loan of the original specimens figured in the ' Mineral Conchology;' 

 and for the pains exhibited in the drawings here published. 



Professor Forchhammer, of Copenhagen, not only placed at my disposal many valuable 

 specimens deposited in the Geological Museum of the University, but applied to Professor 

 Steenstrup, who, in the most generous manner, sent me the collection in the Zoological 

 department, including the highly valuable original specimens of his excellent Memoir on 

 the Fossil Cirripedia of Denmark and Scania. Subsequently, Professor Steenstrup sent 

 me a second large collection, the fruit of the indefatigable labours of M. Angelin, in 



