DEVELOPMENT OF THE SKELETON OF THE TUATARA. 5 
in drawing his attention to certain of the more interesting problems (duly set forth 
in the pages of this Memoir) presented more especially by the skeleton and teeth 
of the adult animal. In reply, he expressed the hope that one of us would undertake 
this portion of the work, and offered, with a generosity and friendly appreciation for 
which we tender him our heartiest thanks, to give all the necessary material he could 
command if we would acquiesce. There accordingly reached us in the autumn of 
1898 a large series of specimens, treated, for the younger stages with corrosive 
sublimate and alcohol, for the older with alcohol alone. From these, after preliminary 
examination, the undermentioned were selected, as embracing the period of skeleto- 
genesis; and, concerning those which remain, Prof. Dendy has very generously 
acquiesced to the proposal that Dr. Elliot Smith and Mr. E. J. Bles, of Cambridge, 
should work out respectively the development of the brain and urinogenital organs. 
List of Young Specimens Investigated (15 in all). 
Stage. No. Date of removal from Egg. 
LT a ape Bmen naanee 87. Jan. 25, 1898. 
Beg era dctasna varices 39 a. Unknown. 
(GI i een nee mare 52a. Jan. 80, 1899. 
Qe ash Axcosties la. End of Jan. 1897. 
IY banana eee ane 142. March 8, 1898. 
1 Bako ecaene ee 154. April 5, 1898. 
NEU yasreeacesiis Sree oe 159. May 12, 1898. 
Je ae a ee ener 162. June 24, 1898. 
Re Silameeiee token cee: I 
SHG: caadeceaannee II 
Siar othe ea IV 
Seen er rere hanes la. Hatched Dec. 8-9, 1898. 
See rr Se cain 194. >» Dec. 27, 1898. 
Simba or seen. eave 138. No details. 
Nh Fae ir dewa Sager Ill 
The following are the details concerning the individuals incubated and afterwards 
reared in our own Laboratory. 
Stage. Length in cms. Remarks. 
IRE Oe setter cnet 6:3 Died in egg, 13.11.98. 
gi. 5 ( Hatched prematurely with 
Sava dai excessive yolk, 22.11.98. 
PRM ee opseaseme ae 15 Hatched 14.1, died 1.5.99. 
giv ae decomposed in egg, 
icaoeHerCOReRE 14.1.99. 
TES eta seas tetas 15 Hatched 19.1, died 18.5.99. 
UR ae ee cinaielesise 17 » 24.1, died 18.5.99. 
