IV PREFACE. 



a carefully selected number of the types of the larger groups. But 

 the exhibition of very complete series, supplemented by models or 

 figures, to illustrate the remarkable life-history of some of these 

 animals, also of specimens of the Worms which possess a special 

 interest from their relation to man, render this Gallery particularly 

 instructive to the student. 



This guide has been prepared by Mr, E. A. Smith, Mr, F. J. 

 Bell, and Mr, R, Kirkpatrick, who have special charge of the 

 collections described. 



Thanks are due to Messrs. A. & C, Black, Messrs, F, Warne & Co,, 

 Messrs, Macmillan & Co,, Crosby Lock wood & Son, and the Linnean 

 Society for kindly allowing the use of cliches from illustrations in 

 various works published by them, 

 A])ril, 1901, 



The present issue is, to a great extent, a reprint of the fourth 

 edition. 



Some important corrections, however, have been made, and 

 further information given where necessary, especially in the part of 

 the Guide which has reference to the Echinoderma, 



British Museum (Natural History), 

 London, S.W. 



August, 1908. 



