CAUDAL AUTOTOMY AND REGENERATION IN THE GECKO 99 
In conclusion, I wish to express my thanks to Professor 
Arthur Dendy, F.R.S., for his kind gift of two tails (one 
regenerated) of Sphenodon punctatus, to Professor 
J. P. Hill, F.R.S., for the loan of three slides of the tail of 
Pygopus sp., to my pupil Mr. B. K. Das, M.Se., University 
of Allahabad Research Scholar in Zoology, for much assistance 
in the practical work connected with caudal regeneration under 
abnormal conditions, and to Professor D. R. Bhattacharya, 
M.Sc., for some aid in 1914. 
APPENDIX. NoTE ON THE REGENERATION OF DIGITS IN AN 
INDIAN TOAD. 
Since, so far as I am aware, only one instance? has yet been 
deseribed of a very limited regeneration of amputated digits 
having occurred in adult Anura, I reproduce here drawings 
(Text-fig. 6) made by my former pupil, Mr. N. K. Patwardhan, 
M.Sc., of regenerated digits in the Indian toad, Bufo melan- 
ostietus. These digits had been removed (in all cases they 
were cut off with scissors to a little below the level of the 
bases of the adjoining digits) for purposes of identification. 
All the figures represent the amount of regeneration which had 
occurred within 73 days of amputation, excepting figs. C, B”, 
1 T refer to Gadow’s statement (Cambridge Natural History, vol. on 
‘Amphibia and Reptilia, p. 67) that in two specimens of Rana tempo- 
raria in which the hand was amputated from the wrist, ‘ within a year 
this changed into a four-cornered stump and two of the protuberances 
developed a little further, reaching a length of about 4mm. These 
specimens lived for four years without further changes,’ 
TEXT-FIG. 6. 
Regenerated Digits of the Indian Toad, Bufo melanostictus, 
from the dorsal aspect (all figures x cir. 3). 
The arrows indicate the regenerated digits. B”’,C,and D’(all males) ~ 
represent 94 days growth; all the others (all females) 73 days 
growth. It is noteworthy that in A and A’ the first digit has 
grown more rapidly than any of the other digits, though these 
animals were females, and the digit therefore was not used for 
the nuptial embrace. 
H 2 
