The Anatomy and Development of Peripatus 

 capensis. 



By the late 



Francis lUaitlaitd Balfour, T.Jj.lf., F.R.S., 



Tellow of Trinity College, Professor of Animal Morphology in the University 



of Cambridge, 



With Plates XIII— XX. 



Introduction. 



The late Professor Balfour was engaged just before his death 

 in investigating the structure and embryology of Peripatus 

 capensis, with the view of publishing a complete monograph 

 of the genus. He left numerous drawings intended to serve 

 as illustrations to the monograph, together with a series of 

 notes and descriptions of a large part of the anatomy of 

 Peripatus capensis. Of this manuscript some portions were 

 ready for publication, others were more or less imperfect ; 

 while of the figures many were without references, and others 

 Avere provided with only a few words of explanation. 



It was obviously necessary that Professor Balfour^s work — 

 embodying as it did much important discovery — should be pub- 

 lished without delay ; and the task of preparing his material 

 for the press was confided to us. We have printed all his 

 notes and descriptions without alteration.^ Explanations which 

 appeared to be necessary, and additions to the text in cases in 

 which he had prepared figures without Avriting descriptions, to- 

 gether with full descriptions of all the plates, have been added 

 by us, and are distinguished by enclosure in square brackets.^ 



J Excepting in an unimportant matter of change of nomenclature used 

 with regard to the buccal cavity. 



" The account of tlie external characters, generative organs, and develop- 

 ment, has been written by the editors. 



VOL, XXIll. — NEW SER. P 



