EXPLANATION OF THE PLATES. 



Twenty three figures have been drawn by Mr. J. F. OBBES of Apeldoorn, Holland; their numbers are: 

 Plate II, Fig. 5 and 6; Plate III, Fig. 10, 10a, \ob; Plate IV, Fig. 10c — iog; Plate V, Fig. 12, 12a — 12c; 

 Plate VI, Fig. 18, iSrt— iS«T; Plate VIII, Fig 24, 240, 27, 27a. 



