PREFACE, 



The present volume of the Studies contains a series of papers that 

 were either written or published before I entered upon my duties 

 as Beyer Professor of Zoology, and, with the exception of the essay 

 by Dr. Hurst on the Structure of Archseopteryx, they were all 

 published during the lifetime of my distinguished predecessor, the 

 late Professor Arthur Milnes Marshall. 



I cannot claim therefore that any of the work recorded in this 

 volume was done at my advice or under my guidance and super- 

 vision, nor can T, on the other hand, be held responsible for the 

 accuracy of the observations or for the opinions expressed in their 

 essays by their several authors. 



The . delay that has occurred in the publication of the volume, 

 consequent on the sudden death of Dr. Marshall and the lapse of 

 time before appointment of his successor, was unavoidable ; but I 

 trust that the appearance of the III rd volume of the Studies will 

 be none the less welcome to those who are interested in the work 

 that is being carried on in the scientific laboratories of our College. 



I would take this opportunity of reminding those Zoologists who 

 read this volume that on the death of Dr. Marshall his relatives 

 very generously gave his scientific books and pamphlets to the 

 Owens College, for the use of the students and teachers of the 

 same for all time. It would add very greatly to the value of this 

 collection if Zoologists would kindly forward to me, for inclusion 

 in 'the Marshall Library,' any separate copies of their publications 

 that they can spare. Such donations would be most gratefully 

 received, as certain to prove of very considerable assistance to those 

 of us who are engaged in original work in this laboratory. 



The third volume of the Studies, although it is the last in which 

 any part was taken by Professor Marshall, does not, by any means, 

 record the end of his work. The stimulus of his teaching and the 

 energy of his character must remain with us in the Owens College 

 for many years to come, and his influence will long be felt in the 

 writings both of his pupils and successors. 



SYDNEY J. HICKSON. 

 September, 1895. 



