ON RECENT POLYZOA. 613 
means of columns and letters, of which the following is a full explana- 
tion :— 
Col. 1. Shetland, a; Orkney Isles, b}; Unst and Hebrides, c. 
. East Coast: Scotland, d; Northumberland, e; Durham and York- 
shire, f. 
. South-east Coast: Hastings, h; Brighton, 7. 
Devon, j; Cornwall, &; West Coast of Ireland, in’’. 
West Coast of England, /; EastCoast of Ireland, im; Antrim, m* ; 
Isle of Man, m’. 
. Guernsey, 7; Jersey, 0. (When every column is filled by an (*) a 
wide distribution is indicated.) 
. Fossil range: Brit. Glacial, 1; Crag, 2; Pliocene, 3*; Miocene, 
Reuss, 3; Eocene, 4. 
Or oo bo 
“NIU 
Explanation of the arrangement of the figures in the left-hand column. 
This British list is completely arranged in accordance with the classi- 
fication adopted by Mr. Hincks. It will be seen that the generic and 
specific arrangement is different from that adopted in the first part of the 
Report, and to keep up a complete uniformity the following explanation 
was necessary :— 
I. The family names in the British list are those used by Mr. Hincks. 
Il. So also are the generic; but against every generic name a number 
has been placed, and this will be found to correspond with the 
number and placement of the genus in the classification of Mr. 
Busk and also the classification adopted by me in the present 
Report. 
III. For obvious reasons I have only numbered in consecutive order 
the British list. The Cycnostomara is likewise numbered conse- 
cutively, but the columns are differently arranged. 
In the other lists the genera are numbered similarly to the British 
list on the left-hand side, but in the first right-hand column the space is 
reserved. If the species named is found in any British locality, the 
number in the British list is given; if not, the space is left bare. By 
this simple method, and without disturbing the text and arrangement of 
different authors, a uniformity of nomenclature throughout the whole of 
the Report is secured. The blank spaces will sufficiently indicate the 
species peculiar to any special area. 
__ The same plan is adopted in the list furnished from Mr. Busk’s 
‘Challenger’ Report of the bathymetrical distribution of species in the 
seven regions given by the author. In the last column of this list the 
geographical distribution is indicated by the use of the following letters, 
as given by Mr. Busk in the Report, pp. ili to xv of preface :— 
A. North Atlantic region; B. South Atlantic region; C.South Indian 
or Kerguelen region; D. Australian region; HZ. Philippine or Japanese 
region; F’, North Pacific region; G. South Pacific region. 
