INTRODUCTION. 149 



Professor Steenstrup, in response to the appeal for specimens 

 at the end of Balfour's posthumous memoir. 



5. Dr. J. Kennel, of Wiirzburg, was kind enough to send 

 me, in exchange for two living specimens of Capensis, 

 two specimens of the smaller species, which he found iu 

 Trinidad. 



6. Four specimens from near Williamstown, South Africa, 

 belonging to the Indian Museum. 



7. All the specimens in the British Museum. These have 

 not, unfortunately, been of so much use to me as I had hoped, 

 on account of their small number and contracted condition, 

 and of the difficulty of getting a sufficiently strong light in 

 the rooms set apart for the examination of spirit specimens 

 in the British Museum, for the minute examination which is 

 required. I am greatly indebted to Professor Jeffrey Bell, of 

 the British Museum, for his courtesy in giving me every 

 facility in his power to examine the specimens. 



8. Two specimens from Queensland, Australia, belonging to 

 Professor Jeffrey Bell. He has been most kind in putting 

 them entirely at my disposal for the purposes of this mono- 

 graph. 



9. About twenty specimens from Demerara, brought alive 

 to England by Mr. W. L. Sclater. Mr. Sclater has himself 

 given a short description of these specimens, and has kindly 

 placed the greater number of them at my disposal for the 

 purposes of this monograph. These specimens were all killed 

 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. XV, of Edwardsii, Moseleyi, 

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

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

 direction. The figures on PI, XVI were made by Miss 

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



