266 



Memoirs of the Indian Museum. 



[Vol. V 



the records by Ortmann from Brazil and by de Haan from Japan are to be dis- 

 credited. 



In the Chilka Lake the species is not abundant, but was found in some numbers 

 in February 1914, near Rambha, when the specific gravity of the water was loii. 

 The specimens, however, were taken near the mouth of a small stream and in this 

 locality the water was doubtless less salt than in other places in the vicinity. The 

 examples obtained in March of the same year at Barkul were caught by fishermen. 



The large number of ovigerous females in the collection, and the total absence of 

 individuals which can be recognised as males, are facts which suggest that the species 

 migrates from the fresh water in the neighbourhood to liberate its young in the lake. 



Palaemon malcolmsoni, Milne-Edwards. 



1910. Palaemon malcolmsoni, Henderson and Matthai, Rec. Ind. Mns.,W , p. 83, pi. xv, f3gs. za-f. 



Ten large ovigerous females of this species were obtained in September 19 14, at 

 Barkul, in company with numerous examples of Palaemon rudis. 



The rostrum, in its shape and dentition, agrees precisely with the description 

 given by Henderson and Matthai. The measurements of the specimens (in mm.) are 

 as follows : — 



At the time of their capture the distinctions between these specimens and females 

 of Palaemon rudis were not appreciated. The two forms may be distinguished by 

 the following characters : — 



The palm in this specimen is quite abnormal in length and has been omitted in calculating the 

 average proportionate length of the segment. The palm of the other chelipede in the same individual 

 is of normal dimensions. 



