HA'i'NES: LARVAL MORPHOLOGY OF PANDALUS TRIDENS 



undeveloped, less than one-half length of exopo- 

 dite, bears three setae distally. Anal spine clearly 

 visible. 



STAGE IV ZOEA 



Total length of Stage IV zoea 7.8 mm (range 



7.0-8.4 mm; 9 specimens). Rostrum (Figure 4Ai 

 projects horizontally but curves slightly down- 

 ward at tip, bears two teeth at base. A few minute 

 spines still on anteroventral and posteroventral 

 margins of carapace. Epipodite of first maxilliped 

 bilobed. Posterior margins of abdominal somites 

 fringed as in Stage III. 



Figure 4. — Stage IV zoea ofPandalus tridens: A, rostrum, right side; B, antennal scale (distal portion), ventral; C, second pereopod 

 Iterminal segments), lateral; D, third pereopod (distal segments), lateral; E, telson, dorsal. 



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