508 MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



Plate XXIII. 



Fig. 1. Eight second pereiopod of male of Alphens sauleyi, var. hrevicarpus, seen from the outer 



side. X 33. 

 Fig. 2. Terminal segments of right fifth i)ereiopod of the same. x33. 

 Pig. 3. Left mandible of the same, seen from the outer side, x 64. 

 Fig. 4. Left first antenna, and left compound eye of the same, seen from above. x33. 

 Fig. 5. Left third maxilliped of the same, seen from outer side, x 33. 

 Fig. 6. Right second maxilliped of the same, seen from the outer side, x 64. 

 Fig. 7. Eight first maxilliped, seen from the outer side. x64. 

 Fig. 8. Eight second antenna of the same, seen from above. x33. 



