348 



FISHERY BULLETIN OF THE FISH AND WILDLIFE SERVICE 



spine did not reach the tip." Examination of 

 postlai-vae of the two species under 12 mm. total 

 lengtli showed this to be an accurate description. 



Williams (1953) compared postlarval and ju- 

 veniles of P. setiferus^ P. aztecus, and P. duo- 

 rarum. He included drawings of the rostra of 

 17-, 27-, 37-, and 47-mm. shrimp of the three 

 species; hence the series of rostral drawings of 

 P. diwrarum were terminated at approximately 

 18 mm. in this paper. 



Lebour (1959) reported larvae of P. duorarum 

 in collections made off the coast of tropical West 

 Africa. She figured a 4 + 0-rostral-spine stage 

 (fig. la, p. 141), having well-developed biramous 

 pleopods — a condition not appearing in postlarval 

 P. duoro,Tni')n from Florida waters until the stage in 

 which 8 or 9 doreal spines are present on the 

 rostrum. 



SUMMARY 



Four rearing experiments were conducted in 

 which the larvae of Penaeus dxiorarnm-, the pink 

 shrimp, were raised from eggs obtained from ma- 

 ture females. Young were reared through five 

 nauplial stages and into the first protozoeal stage. 



The egg, five nauplial, three protozoeal, three 

 mysis, and two postlarval stages are described and 

 illustrated. In addition, a series of thirteen draw- 

 ings of the rostra of advanced postlarvae is in- 

 cluded. The first six stages were described from 

 specimens raised from eggs, while the remainder 

 of tlie stages were described from specimens 

 collected from the plankton. 



The larval stages of P. duoraruTn are compared 

 with those of P. setiferus as described by Pearson 

 (1939). Differences between the postlarvae of 

 P. duoraruin and P. aztecus, as noted by Williams 

 (1959), are discussed. 



REFERENCES 



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1957. The relationship between diet and larval de- 

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1939. Further observations on Penaeidae of the 

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