DEVELOPMENT OF THE SKELETON OF THE TUATAEA. 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. 



P 87. 



P* 39a. 



Q*t 52a. 



Q la. 



R 142. 



R 154. 



R 159. 



R 162. 



R-St I. 



St n. 



St IV. 



S* Iff. 



S* 19a. 



S 138. 



Tt in. 



Date of removal from Egg. 

 Jan. 25, 1898. 

 Unknown. 

 Jan. 30, 1899. 

 End of Jan. 1897. 

 March 8, 1898. 

 April o, 1898. 

 May 12, 1898. 

 June 24, 1898. 



Hatched Dec. 8-9, 1898. 



„ Dec. 27, 1898. 

 No details. 



The followinsr are the details concerning the individuals incubated- and afterwards 



reared in our own Laboratory. 



Stage. Length in cms. 



R-Si- 6-3 



S"- 7-5 



Ti"- 15 



S^^- 



T"^- 15 



T^i. 17 



Eemarks. 

 Died in egg, 13.11.98. 

 f Hatched prematurely with 

 t excessive yolk, 22.11.98. 

 Hatched 14.1, died 1.5.99. 

 J Found decomposed in egg, 

 1 14.1.99. 

 Hatched 19.1, died 18.5.99. 

 24.1, died 18.5.99. 



