With Ten Plates, Royal Ato, 5s. 
CONTRIBUTIONS TO THE KNOWLEDGE OF RHABDOPLEURA 
AND AMPHIOXUS. 
By E. RAY LANKESTER, M.A., LL.D., F.R.S. 
London: J. & A. CHURCHILL, 7 Great Marlborough Street. 
Quarterly Journal of Microscopical 
Science. 
The SUBSCRIPTION is £2 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 Journat, which remain in print, are 
now sold at an uniform price of 10/-. 
The issue of SuppLemeNt Noumpers being found inconvenient, 
and there being often in the Hditor’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/-, and Four Numbers make upa 
Volume. 
London: J. & A. CHURCHILL, 7 Great Marlborough Street. 
TO CORRESPONDENTS. 
Authors of original papers published in the Quarterly Journal 
of Microscopical Science receive twenty-five copies of their 
communication gratis. 
All expenses of publication and illustration are paid by the 
publishers. . 
As a rule lithographic plates, and not woodcuts, are used in 
illustration. 
Drawings for woodcuts should nor be inserted in the MS., 
but sent in a separate envelope to the Editor. 
Contributors to this Journal requiring ewtra copies of their 
communications at their own expense can have them by applying 
to the Printers, 
Messrs. ApLARD & Son, 224, Bartholomew Close, E.C., on 
the following terms: 
For every four pages or less— 
25 copies : : ‘ ; 5/- 
a0... , : 6/- 
TOO ~, : ; i 7/- 
Plates, 2/- per 25 if uncoloured; 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 
or Messrs. J. & A. Cuurcuitt, 7 Great Marieorouesd Srreer, 
Lonpon, W. 
