Mr. G. Lewis on 



Fig. 1. 



Fig. 4. 



cyliudrical and membranous, without any sharp line of 

 demarcation at junction with the connecting membrane ; 

 there appears to be no specialized internal sac. 



"Trypanceus ensifer (fig. 3). — The last abdominal segment^ 

 which is hidden under the pygidium, is of a simple nature, 

 without any struts ; the second connecting membrane, 

 which is very long, joins directly on to the ventral plate, and 

 sends out no struts or plates into the abdomen. The basal 

 piece is cylindrical {bp), about two and a half times the 

 length of the lateral lobes, membranous, with two lines more 

 highly chitinized extending from the base of the lateral 

 lobes to end of basal piece ; the lateral lobes (//) are sub- 

 cylindrical, more highly chitinized than the basal piece except 



