266 



Memoirs of the Indian Museum. 



[Voi,. 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 roil. 

 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. Mus., Y , p. 83, pi. xv, figs. 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 : — 







eu 

 



4-> 



.d 



1 



1 — 1 











Proportionate length of segments 







cd 



a, 



bu 



J3 





Larger eneiipeae : 





of larger chelipede to total 





J3 



d 



0) 



ce 

 u 



cd 



V 



«4-1 









4) 



O 





length of 





length of chelipede (10c 



)•• 



S 





</5 





3 



B 





ai 





c/5 



3 



Xi 





■4-j 



4J <L> 



- t -' T3 



d 



m 



3 



• 



!>! 



3 



(A 



3 





>> 



S 



d 



O 



H 



O 



h4 



to S 

 <u 



CxO cj 

 S Cl, 

 (LI ^ 



h} 



ja 



CJ 



y- 1 



d 



H 



0) 



a, 



CO 







ca 



PL, 



4-> 

 O 



Cd 



Q 



Xi 





 (/) 



1— 1 



3 

 u 



CS 



U 



3 



Ph 



■4-> 

 O 



cd 

 O 



i 



136 



37 '9 



108 



I08 



19-9 



21'4 



27'5 



20'3 



169 



18-2 



19-6 



25-2 



186 



1.5 5 



2 



136 



36-5 



101 



104 



18-8 



20-4 



25-9 



200 



167 



18-0 



196 



24-9 



19-2 



i6 - o 



3 



125 



30'5 



97 



98 



37-1 



l8-4 



22'2 



197 



16-5 



17-4 



i8-8 



22 6 



20'I 



16-8 



4 



122 



35'3 



98 



93 



175 



I9'5 



228 



20-5 



149 



17-8 



199 



233 



20'9 



15-2 



5' 



122 



299 



88 



92 



15 9 



l87 



20-5 



20 6 



14-1 



I7'3 



204 



22'3 



22'5 



I5-4 



6 



119 



324 



81 



86 



15-8 



i6t 



19-6 



i6-6 



13-2 



18-3 



187 



227 



I93 



153 



7 



Il6 



317 



84 



84 



15-3 



168 



20 - 4 



15-4 



12-2 



18-2 



20-0 



243 



18-3 



i4-5 



8 



Il6 



29-4 



77 



78 



144 



15-2 



188 



15-2 



II'I 



18-4 



195 



24-1 



I9-5 



14 '2 



9 



I05 



27-5 



73 



78 



i4 - o 



14-6 



17-8 



160 



ii-9 



17-9 



187 



22'8 



20-5 



15-2 



10 



107 



28-8 



72 



77 



130 



15-2 



18-3 



15-1 



10 2 



169 



10/8 



23-8 



19-6 



136 



- 





- 











Average 





17-8 



I9'5 



23-6 



197 



15-2 



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 : — 



1 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. 



