78 
Proceedings of the Eoyal Society of Edinburgh. [Sess. 
VIII.— Regeneration of the Legs of Decapod Crustacea from the 
Preformed Breaking Plane. By J. Herbert Paul, M.A., B.Sc., 
Barbour Research Scholar, Physiological Department, Glasgow 
University. (With Four Plates.) Communicated hy Professor D. 
Noel Paton. 
(MS. received December 4, 1914. Read December 21, 1914.) 
CONTENTS. 
PAGE 
Introduction .......... 78 
Historical . . ....... 79 
Methods and Material ........ 81 
Observations .......... 82 
1. The Provisions for Loss of the Limb ...... 82 
2. Papilla-formation ........ 84 
3. The Changes at Moulting ....... 88 
Discussion .......... 89 
Summary ......... 91 
Bibliography .......... 92 
Description of Plates ........ 93 
Introduction. 
The observations recorded in the following pages are the result of work 
continuously prosecuted from March 1913 until the date of writing 
(November 1914). Several series of observations have been carried out 
under strict experimental conditions, and many observations have been made 
on decapods taken from the trawl and shore. At the same time I have 
been able to take note of the regenerative processes in the large numbers of 
captive Crustacea in the tanks at the Marine Biological Station, Millport, 
where the work has been largely carried out. 
The object for present publication is to make a general statement of 
the results up to the time of writing. While these agree in most respects 
with work of the same nature carried out by previous observers, many 
phenomena hitherto unnoticed have been recorded. These are of distinct 
interest and must be taken into account in discussion of the physiological 
and developmental problems connected with limb regeneration which I 
hope later to take up. 
The work was first suggested by Prof. Noel Paton, in whose department 
all the histological work and some of the experiments were carried out. I 
have to thank him sincerely for his sympathy and encouragement. To the 
staff at the Marine Biological Station, Millport, especially to Mr Elmhirst, 
