Plate I. 



EnpIecteNa imperialis Ij. 

 All figures in reduced scale of size. 



Pig. 1. An old specimen, 588 ram. long, of fully mature form. 



Fig. 2. A specimen, 491 mm. long, in wiiich the nppcr part had not yet 



attained full size. 

 Fig. 3. A rather yoimg specimen, 245 mm. long. 



