508 MEMOIRS OF THE NATIONAL ACADEMY OF SCIENCES. 



PT.ATK XXIII. 



FIG. 1. Eight second pereiopod of male of Alpheux xanlcyi, var. brevicarpws, seen from the outer 



side, x 33. 



FIG. 2. Terminal segments of right fifth pereiopod of the same. x33. 

 FIG. 3. Left mandible of the same, seen from the outer side. x64. 

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

 FIG. 5. Left third maxillipetl of the same, seen from outer side. x33. 

 FIG. 6. Right second maxilliped of the same, seen from the outer side. x64. 

 FIG. 7. Right first maxilliped, seen from the outer side. x64. 

 FIG. 8. Right second autenua of the same, seen from above. x33. 



