V. 



Vv 



Vl4 Vl5 Vl6 Vl7 V,8 Vi9 V20 



% V7 Vs % VlO Vi, V,2 713 



ADROSTAL SULCUS ENDING FROM POSTERIOR MARGIN CARAPACE- 

 CARAPACE LENGTH 



FiGUBE 59. — Percent frequency of ratio of postsulcal carapace length to carapace length in 1. Penaeus (M.) aztecus 

 aztecus Ives; 2. Penaeus (M.) aztecus suhtilis Perez Farfante, from the Caribbean region and eastern Brazil; 

 3. Penaeus (M.) aztecus stibtilis P^rez Farfante, from the Gulf of Paria to Camocim, Brazil. 



WESTERN ATLANTIC SHRIMPS OF GENUS PENAEUS 



553 



