16 BRITISH SILURIAN BRACHIOPODA. 
liberal manner with which they afforded me all the information I required ; as well as for 
the loan of the large and exceedingly important national collection of Silurian Brachiopoda 
that had been assembled during the progress and labours of the Geological Survey of Great 
Britain, and which I consider to be the most extensive and most valuable series, as a single 
collection, ever brought together under one roof. From this collection I have now figured 
a very great number of specimens; it contains also the types of many species that 
had been previously described and illustrated by Portlock, Phillips, Salter, myself, and 
others. 
My best thanks are likewise due to the Council of the Geological Society, who, 
besides awarding to me their much valued Wollaston Medal, have, in the most liberal 
manner, placed their Silurian collections at my command for the present Monograph. The 
Society's Museum contains the very valuable original types described and illustrated in the 
‘Silurian System,’ as well as a series of specimens collected by the late Mr. Daniel 
Sharpe; and from these two sources I have figured many specimens. My thanks also are 
due to the officers of the Geological Department of the British Museum for the free access 
I have had to their specimens ; but although our National Museum contains the important 
Upper Silurian collection made by Mr. Gray, of Hagley, it is still very deficient in species 
and specimens from our Lower Silurian Rocks,—which deficiency will, I trust, with 
time be made good. ‘The next to which I must particularly refer is the very extensive 
collection assembled with much care by the Rev. Adam Sedgwick, during his very 
important study of the Welsh Lower Paleozoic deposits, and subsequently deposited by 
him in the Woodwardian Museum of Cambridge. ‘This series of fossils has been minutely 
described and partly figured by Prof. M‘Coy in his work on ‘ British Palzeozoic Fossils.’ 
This Museum also possesses Mr. Fletcher’s valuable series of Upper Silurian fossils. 
I am, therefore, much indebted to Prof. Sedgwick, as well as to Mr. H. Seeley, for having 
been able to consult its specimens. 
My thanks are also due to the Directors of several provincial Museums, such as those of 
Ludlow, Dudley, Worcester, &c., as well as to the following gentlemen, who have not only 
kindly lent me their specimens, but have also afforded me much valuable information :— 
Mr. J. W. Salter (London); Mr. D.C. Davies (Oswestry) ; Prof. J. Morris (London) ; Mr. 
G. H. Morton (Liverpool) ; Mr. W. Fletcher (Stourbridge) ; Mr. J. Gray (Hagley) ; Mr. 
W. Prosser (Lancaster); Mr. W. Walton (Bath) ; the late Mr. J. Mushen (Birmingham) ; 
Mr. E. Wood (Richmond, Yorkshire) ; Mr. S. W. Williams (Rhayaden) ; Mr. R. Lightbody 
(Ludlow) ; Mr. W. Vicary (Exeter); Mr. R. H. Valpy (Newbury); Mr. Griffith Davies 
(London) ; Dr. H. B. Holl (Worcester) ; Mr. L. P. Capewell (Dudley) ; Mr. W. Lewis 
(London); Mr. R. Tate (London); Mr. Winwood (Devonshire); Mr. H. Wyatt-Edgell 
(London) ; Mr. W. Cocking (Ludlow); Mr. Marston (Ludlow); Mr. W. Pengelly 
(Torquay); Mrs. Branwell (Brighton) ; Prof. Harkness (Cork) ; the Rev. J. D. Latouche ; 
the Rev. P. B. Brodie (Rowington) ; Mr. G. Sharman (London); Mr. T. J. Shedden 
(Walsall); Prof. T. Rupert Jones (Sandhurst); the Rev. T. Wiltshire (London) ; &c. 
