Male. Head semi-circular anteriorly, closely united to the succeeding seg- 

 ment. Third and foiu'th thoracic segments widest. Body oblong, boat-shaped, 

 tapering slowly from the fourth to the seventh thoracic segment. 



Outer antenn;i3 four-jointed; inner very small, reaching about to the middle 

 of the second segment of the outer. 



Eyes too small to be distinguished by a Coddington lens. 



First abdominal segment a little nan-ower than last thoracic, but flat; suc- 

 ceeding segments tapering rapidly to the sixth or telson, which is pointed at 

 the end, and is provided on each side with a small lamella, giving the whole 

 telson somewhat the apjjearance of a spear-head. 



The lateral laminpe of the first five abdominal segments round in sections 

 instead of segmental, as in the female, and considerably longer than the width 

 of the segments to which they are attached. 



