viii PREFACE. 



and study, an increased library, an extended knowledge of 

 the papers on fossil Bryozoa, and a great addition of fossil 

 material, besides the settlement of the question as to what 

 the true Bryozoa include. 



With the great variety of opinions on much connected 

 with this subject of synonymy, it would be impossible to 

 adopt that of all writers, but the lines I have worked upon 

 are those of Mr. Hincks and Mr. Waters, for recent and 

 fossil respectively, venturing to differ from these known 

 authorities only on rare occasions. 



There will be found in this Catalogue a few species of 

 which I could not trace the references, not even with the 

 help most kindly and unstintingly given me by Mr. Kirk- 

 patrick, of the British Museum, to whom I would here 

 offer my thanks for all his assistance. Such are the 

 ' Bugula Smittii' of Sars, the ' Salicornaria gracilis' of 

 Costa, and two or three more. 



I am painfully conscious of the faults that accompany 

 this Catalogue, and it is with the utmost diffidence that I 

 offer it for the use of students. It has been the occupation 

 of several years of ill-health, and to delay publication for 

 the advantage of further revision would probably result in 

 no publication at all. During this year alone it has been 

 entirely laid aside for four months in consequence of ill- 

 health. All that I can urge is, that it is an attempt which, 

 thus far, has never been made, and I offer it as a stepping- 

 stone to the next student who will undertake a similar 

 work. To render a Catalogue of this description perfect 

 would require an examination of all the type specimens 

 in museums and private collections everywhere, a thing 

 which is all very well in theory but impossible in practice. 



To Mr. Hincks for help in references, and to Mr. Deby, 

 of London, for the loan of some rarer books and papers/ 

 my thanks are here tendered. 



