dD ng OS 
Stas 
PREFACKH. 
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 [ applied, I have in every instance received 
the most courteous acquiescence to my demands. To Mr. Fitch, of Norwich, I here beg 
to return my 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 pulchella, and other species. Professor Buckman sent me, of his 
own accord, a fine series of the valves of Pollicipes ooliticus, the most ancient Cirripede 
as yet known, discovered and named by him. ‘To Messrs. Flower, Searles Wood, 
F. Edwards, Harris, 8. Woodward, Tennant, and other gentlemen, I owe the examination 
of several species new to me. Mr. Morris and Professor HK. 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 
