TRANSACTIONS 
OF THE 
bull Scientific 
AND 
Ficld Waturalists’ Club. 
EDITED BY THE SECRETARY. 
THE DIATOMACEZ OF THE HULL DISTRICT. 
By F. W. Mitts, F.R.M.S., anp R. H. PHui.ip. 
INTRODUCTORY NOTE. 
HE valuable list of Diatoms of the Hull District, published 
by the late Geo. Norman, in 1859, of which a revised 
and extended list was issued in 1865, proved of such 
use to students of these fascinating microscopic plants, that 
it has been referred to and quoted from by many later writers 
on the subject. But since that time the study of Diatoms 
has made extensive strides, and it has been found necessary 
to largely revise the nomenclature, in view of fresh light from 
the work of many observers. In consequence of this, 
Norman’s list is, as far as the names are concerned, fast 
becoming obsolete, and to the compilers of the present list it 
seemed desirable to thoroughly revise his records and bring 
his nomenclature up to date. 
In addition to this, many fresh species have been noted in 
the district, which are here included. 
Most of the illustrations have been drawn from the figures 
contained in Smith’s ‘‘Synopsis of the British Diatomacez,”’ 
Schmidt’s ‘‘Atlas der Diatomaceenkunde,’”’ Van Heurck’s 
** Synopsis des Diatomées de _ Belgique,’ Peragallo’s 
‘‘Diatomées Marines de France,” and ‘‘Monographie du 
157 A 
