XXV. THE ANATOMY AND DEVELOPMENT OF PERIPATUS 



CAPENSIS 1 . 

 (With Plates 4653.) 



INTRODUCTION. 



THE late Professor Balfour was engaged just before his death 

 in investigating the structure and embryology of Peripatus 

 capcnsis, 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 were 

 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 2 . Explanations which 

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

 which he had prepared figures without writing descriptions, to- 

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

 by us, and are distinguished by enclosure in square brackets 3 . 



We have to thank Miss Balfour, Professor Balfour's sister, 

 for the important service which she has rendered by preparing 



1 From the Quarterly Journal of Microscopical Science, April, 1883. 



2 Excepting in an unimportant matter of change of nomenclature used with regard 

 to the buccal cavity. 



3 The account of the external characters, generative organs, and development, has 

 been written by the editors. 



