214 PROFESSOR F. M. BALFOUR. 



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

 for the important service which she has rendered by preparing 

 a large part of the beautiful drawings with which the mono- 

 graph is illustrated. Many of these had been executed by her 

 under Professor Balfour's personal supervision ; and the know- 

 ledge of his work which she then acquired has been of the 

 greatest assistance to us in preparing the MSS. and drawings 

 for publication. 



Since his death she has spared no pains in studying the 

 structure of Peripatus, so as to enable us to bring out the 

 first part of the monograph in as complete a state as possible. 

 It is due to her skill that the first really serviceable and accurate 

 representation of the legs of any species of Peripatus available 

 for scientific purposes are issued with the present memoir.^ 



We have purposely refrained from introducing comments on 

 the general bearing of the new and important results set forth 

 in this memoir, and have confined ourselves to what was 

 strictly necessary for the presentation of Mr. Balfour's dis- 

 coveries in a form in which they could be fully comprehended. 



Mr. Balfour had at his disposal numerous specimens of 

 Peripatus novse zealandise, collected for him by Professor 

 Jeffrey Parker, of Christchurch, New Zealand ; also specimens 

 from the Cape of Good Hope collected by Mr. Lloyd Morgan, 

 and brought to England by Mr. Roland Trimen in 1881 ; and 

 others given to him by Mr. Wood Mason, together with all the 

 material collected by Mr. Moseley during the Challenger voyage. 



A preliminary account of the discoveries as to the embryology 

 <of Peripatus has already been communicated to the Royal 

 Society.^ It is intended that the present memoir shall be fol- 

 lowed by others, comprising a complete account of all the 



species of the genus Peripatus. 



H. M. Moseley. 

 A. Sedgwick. 



' The drawings on PI. XIV, figs. 9 and 10 on PI. XV, and the drawings of 

 the embryos (except fig. 37), have been made by Miss Balfour since Professor 

 Balfour's death. 



^ ' Proc. Royal Soc.,' 1883. 



