434 ADAM SEDGWICK. 



and opened by me shortly after their arrival in order that 

 their embryos might be cut out and preserved. The result 

 is that they are somewhat contracted and not so favorable 

 for observation as they would have been had they been 

 drowned. 



Of the figures illustrating this monograph, the beautiful draw- 

 ings of Capensis on PI. XXXV, of Edwardsii, Moseleyi, 

 and Novse-zealandise on PI. XXXVII, were made by Miss A. 

 B. Balfour in Professor Balfour's lifetime and under his 

 direction. The figures on PI. XXXVI were made by Miss 

 Balfour after her brother's death. To enable me to complete 

 the illustrations required and to assist in the publication of 

 the monograph, the Government Grant Committee of the 

 Royal Society granted the sum of £50. Figs. 16, 17 — 20, and 

 30 were made at Oxford by Mr. W. H. Hill, under Professor 

 Moseley's direction and supervision. The remainder of the 

 drawings, including that of the living animal of PI. XXXIV, 

 were made by Mr. E. Wilson, of the Cambridge Scientific 

 Instrument Company. My best thanks are due to these 

 gentlemen for the care and skill with which they have exe- 

 cuted their work. 



Finally, I have again to acknowledge my indebtedness to 

 Professor Jeffrey Bell for his assistance in preparing the 

 Bibliography. Several papers which had escaped my notice 

 were first pointed out to me by him. 



For an account of the general anatomy and characters of the 

 genus Peripatus, I must refer to the memoirs of Moseley 

 (No. 18), Balfour (No. 28), and Gaffron (Nos. 34, 35). In 

 this monograph only those features of a specific differential 

 value are dwelt upon. I have, however, made a partial ex- 

 ception to this rule in the case of Capensis, the external 

 characters of which have been described at considerable 

 length. The reader will be able to gather from this descrip- 

 tion a sufficient knowledge of the general external features of 

 the genus to enable him to understand the short descriptions 

 of the other species. 



