FISHERY BLILLETIN VOL 77. NO ;i 



rounded prominence near posterior edge. These 

 two prominences occur in all seven zoeal stages. 

 Pterygostomian spines present, but minute and 

 usually hidden by sessile eyes. Three to four mi- 

 nute denticles on ventral margin of carapace im- 



mediately posterior to pterygostomian spine, and 

 about 12 somewhat larger denticles along pos- 

 teroventral margin of carapace. Denticles in 

 Stages Mil, but rarely in Stage IV. Denticles vary 

 in number among stages and among individuals in 



0.25 mm 



626 



