11 



The last pair of thoracic legs have no esopodite, or, at most and very 

 rarely, a mere papilla -like vestige of one. 



The rostrum has a distinct double curve, and commonly, even in large 

 adults, reaches a short way beyond the tip of the antennular peduncle : the 

 groove on either side of the rostrum is less distinct, and ends in front of the 

 last (epigastric) tooth. 



The cervical suture (which, as in P. monodon, is present only in the vicinity 

 of the hepatic spine) is much less distinct ; and the post-antennal or subhepatic 

 ridge, which defines the branchial region anteriorly, is horizontal, not oblique. 



The upper (outer) antennular flagellum is longer than its peduncle. 



The external maxillipeds and third chelipeds may be a little longer, the 



latter sometimes reaching beyond the tip of the antennal scale ; but as the 



length of these appendages varies with age and sex, this is not a character of 

 much importance. 



This species grows to a length of at least a foot. It is the commonest 

 salt-water prawn of the Calcutta market, and is found all round the coasts of 

 India and Ceylon from Karachi to Mergui and the Andamans. 



The collection contains 75 specimens, registered under the following 

 numbers : — 



3123 4327-30 4336-38 

 ~5~' 9 ' 9 



8155 

 8713 4326 



Hooghly Delta. 



Mersrui. 



Andamans. 



Karachi. 



Pulicat. 



^ 



9 

 4331 



9 

 4342 



^ 9 



Ganjam and Orissa. ' 



Akyab. 



Madras and Pondicherry. 



Canara (Malabar coast). 



Bombay. 



Colombo. 



Nagasaki. 



A. J. Milner and Mus. Collector. 

 J. Anderson. 

 G. H. Booley : F. Day. 

 Karachi Museum. 



" Investigator." 



F. Stoliczka. 

 Purchased. 

 F. Day. 

 Purchased. 

 J. Anderson. 

 Berlin Museum. 



