With Ten Plates, Royal 4 to, 5s. net. 
CONTRIBUTIONS TO THE KNOWLEDGE OF RHABDOPLEURA 
AND AMPHIOXUS. 
By Sib RAY LANKESTER, K.C.B., M.A., LL.D., F.R.S. 
London: J. & A. Chubchill, 7 Great Marlborough Street. 
Quarterly Journal of Microscopical 
Science. 
The SUBSCRIPTION is 42s. for the Volume of Four Numbers; 
for this sum ( 'prepaid ) the Journal is sent Post Free to any part 
of the world. 
BACK NUMBERS of the Journal, which remain in print, are 
now sold at a uniform price of 10/6 net. 
The issue of Supplement Numbers being found inconvenient, 
and there being often in the Editor’s hands an accumulation of 
valuable material, it has been decided to publish this Journal at 
such intervals as may seem desirable, rather than delay the appear- 
ance of Memoirs for a regular quarterly publication. 
The title remains unaltered, though more than Four Numbers 
may be published in the course of a year. 
Each Number is sold at 10/6 net, and Four Numbers make 
up a Volume. 
London : J. & A. CHURCHILL, 7 Great Marlborough Street. 
TO CO RRESPOND ENTS. 
Authors of original papers published in the Quarterly Journal 
of Microscopical Science receive fifty copies of their communica- 
tion gratis. 
All expenses of publication and illustration are paid by the 
publishers. 
Lithographic plates and text-figures are used in illustration. 
Shaded drawings intended for photographic reproduction as half- 
tone blocks should be executed in “ Process Black” diluted with 
water as required. Half-tone reproduction is recommended for 
uncoloured drawings of sections and of Protozoa. 
Drawings for text-figures should not be inserted in the MS., 
but sent in a separate envelope to the Editor. 
Contributors to this Journal requiring extra copies of their 
communications at their own expense can have them by applying 
to the Printers, 
Messrs. Adlard & Son & West Newman, Ltd., 23, Bartholomew 
Close, E.C., on the following terms : 
For every four pages or less — 
25 copies .... 5/- 
50 „ .... 6/- 
75 „ .... 6/6 
100 „ .... 7/- 
Plates, 2/- per 25 if uncolqtired ; if coloured, at the same rate for 
every colour. 
Prepayment by P.O. Order is requested. 
All Communications for the Editors to be addressed to the care 
of Messrs. J. & A. Churchill, 7 Great Marlborough Street, 
London, W. 
