21^ Rev. T. Hincks on Bntish Polyzoa. 



the text at the head of the first part of this series of papers, 

 quoted from Mr. Wallace's ' Distribution of Animals,' how- 

 ever far short of its requirements I may myself have reached. 

 Uniformity of method in recording natural-history observa- 

 tions, especially as regards distribution and migration, is a 

 desideratum which, I hold, is only second in importance to 

 uniformity of nomenclature. I confess, however, that I see 

 little hope of such a uniformity being established, unless the 

 subject be taken up by an influential body of naturalists, dis- 

 cussed and formally sanctioned and adopted, and advocated in 

 somewhat the same manner as ' The British-Association Rules 

 for Zoological Nomenclature.' This accomplished, however, 

 upon a firm basis, the future work of naturalists in these 

 branches (distribution and migration) could not fail to be 

 made easier and smoother; and thereby science would be 

 materially aided and advanced, and our knowledge of distri- 

 bution more rapidly extended. If I have, in the very smallest 

 degree, contributed towards its attainment, or have even 

 awakened a desire in others for such a uniformity of method, 

 I shall feel that all the labour expended on the above papers 

 has not been entirely fruitless. 



It only remains for me to thank kind friends and corre- 

 spondents for the assistance they have rendered rae in the 

 course of my work, hoping that, so far as it is carried out, it 

 will meet with their approval, as a contribution to our know- 

 ledge of the distribution of species in Europe. 



Erhatum in Part II. 



I'age 13 (Tables), in the column for the N.E. District insert the symbol ^ 

 opposite Hirundo rtistka {aact. 13). 



Page 18, delete 19 before Circus cerughiosus. 



Page 19, under Asio otus, instead of " same category as No. 19," read 

 " The actual occurrence north of 64° 30' N. lat. is doubtful ;" and 

 thereafter, wherever the words " same category as No. 19 " occur, 

 viz. under (8), (14), (18), (20), (32), read " same categoiy 

 as (7>." 



Page 24, delete " vide Postscript, p. 30." 



XXVIII.— On British Fohjzoa.—VsiYt I. 

 By the Rev. Thomas Hincks, B.A., F.R.S. 



The first part of this paper is devoted to brief descriptions of 

 a number of new fgnns, which I hope shortly to illustrate 

 more fully and to figure in my forthcoming ^ History of the 

 British Marine Polyzoa.' 



