I9I5-] 



Fauna of the Chilka Lake : Crustacea Decapoda. 



269 



The teeth on the rostrum are more variable in number than is indicated in the 

 description given by Henderson and Matthai. On the upper margin there are from 

 9 to 12 (usually 10 or 11) and on the lower margin from 3 to 5 (usually 4). In all 

 cases the three posterior dorsal teeth are situated on the carapace. 



The measurements of a series of males are shown below. Of these specimens , 

 nos. 1 — 16 are fully developed, — that is to say, they have assumed the characters 

 typical of large individuals of their sex. The second peraeopods or chelipedes 

 are usually unequal in length and the larger of the two is nearly equal to, or con- 

 siderably longer than, the total length; the segments are clothed with a fine velvety 

 pubescence and tubercles are present on the fingers on either side of the cutting edge. 

 With these features a well marked colour distinction is correlated, the chelipedes 

 being dark blue-grey with a pale dorsal stripe. 







CD 





>.-« 











Proportionate 



length of segments 







a! 

 Oh 



^3 



CD 





Larger chelipede : 





of larger chelipede to total 





X) 

 c 



C3 



O 



M 



• T-H 



CD 

 O 0) 



O 

 4-> 

 *HH 



CD 

 »— * 







*3 CD 





1 



sngth 01 





length of 



chelipede (100 



: 











<Â 











to 



CD 



<u 





Oh 



.3 -~ 



a 



. 



</5 





3 



ä 



, 



Cfi 





J3 



.Q 





■u 



+J "ÖJ 



-'-' tl 



3 



to 



3 



• 



*>> 



3 



en 



3 



• 



*>> 



S 



3 



CS 



+-> 







Öß 

 Ö 



CD 



61 S 



00 cd 



G Oh 



CD 







3 

 CD 



Oh 

 Cd 



*-H 



CO 



H-> 

 CJ 



ai 



3 

 



3 



H 



CD 



Oh 

 H 

 Cd 



a 



13 



H-> 



O 



fc 



JH 



t-I 



h4 



i-T 



CO 



t— 1 



S 



O 



Oh 



Q 



CO 



§ 



O 



Oh 



Q 



I 



I08 



33*2 



182 



209 



21*0 



41-4 



635 



45 '0 



357 



io-o 



I9-8 



30-4 



2i-5 



i6-6 



2 



114 



344 



202 



138 



20-0 



39 -1 



60-3 



469 



358 



10 



I95 



30 2 



23-4 



17-9 



3 



110 



35'0 



182 



198 



20-0 



38-6 



38-5 



43 - o 



36-8 



101 



19 5 



29-5 



217 



18-6 



4 



106 



322 



180 



198 



20 8 



407 



59"5 



40-4 



35'3 



10-5 



20'6 



300 



20'4 



17-8 



5 



112 



33'5 



173 



192 



205 



38-0 



60 3 



400 



32-0 



107 



19-8 



3I4 



208 



16 7 



6 



I08 



337 



165 



179 



I9-9 



35-8 



53'2 



37'2 



32-3 



no 



20'0 



29-8 



208 



i8-i 



7 



I08 



32-0 



162 



174 



19 



34-0 



51-3 



38-5 



31-0 



108 



19-4 



29-2 



21-9 



177 



8 



94 



28-1 



144 



173 



177 



350 



53 4 



35 - 4 



298 



102 



20-2 



30-8 



205 



17-2 



9 



112 



34"2 



156 



168 



20-8 



34-8 



49-1 



38-4 



31 2 



12-5 



20'9 



29 "5 



23-0 



187 



10 



94 



28-8 





120 



i4 - o 



23-2 



330 



26-8 



2I"6 



117 



i9"3 



27 '5 



22-3 



i8-o 



11 



94 



28-2 



105 



ÏIÏ 



137 



219 



32-0 



237 



193 



123 



197 



28-8 



21-3 



17-4 



12 



100 



287 



IO4 



IO4 



132 



20-3 



30-2 



19-0 



167 



127 



195 



29 



18-2 



160 



13 



94 



27-4 



9 r 



85 



11-9 



17-2 



25 - 4 



185 



15-0 



13 I 



18-9 



27-9 



203 



16-5 



14 



98 



28-8 



90 



86 



ii-8 



17-8 



26-4 



165 



16-3 



I3'I 



19 6 



29-3 



i8-3 



181 



15 



77 



20*4 



87-5 



80 



io"5 



16-3 



25-5 



19-5 



15-0 



120 



18-6 



291 



22 2 



17-1 



16 



89 



255 



84 



8?-5 



II-2 



17-3 



256 



15-1 



16-3 



12-8 



197 



29-2 



17 2 



186 



17 



71 



18-8 



525 



53"5 



82 



io-i 



14-8 



10-3 



94 



15-3 



189 



277 



I9-3 



17-6 



18 



68 



T7-5 



478 



47-8 



80 



9-6 



132 



8-8 



72 



167 



20*1 



27-6 



18-4 



15-0 



19 



57 



14-1 



427 



427 



65 



80 



ii-8 



77 



7-6 



I -2 



18-7 



27 6 



18-0 



17-8 



20 



39'5 



9'3 



25 5 



25 5 



4-1 



48 



6-9 



41 



43 



i6-i 



i8-8 



27-0 



16-1 



t6 9 



21 



265 



5'4 



I4'3 



I4-3 



2-6 



29 



4 -1 



2-3 



2-1 



18-2 



20-3 



287 



161 



147 



22 



i9-5 



37 



io-6 



io'6 



1-9 



23 



31 



18 



i-8 



17-9 



217 



29-2 



17-0 



i7'o 



23 



58-5 



13-1 



360 





63 



7*3 



10 



5'2 



7-0 



17-5 



203 



27-8 



I4-5 



I9-5 



24 



53 



119 



325 



33"2 



5'3 



6-6 



8-5 



40 



6-8 



15-9 



IQ9 



25-6 



12-0 



20-5 



25 



39 



87 



23-2 



23-2 



4'2 



4-8 



67 



33 



43 



i8-i 



207 



28-8 



14-2 



i8-5 











Avera 



a;e of sc 



lecitnen 



s nos. i — 9 





io*6 



20 



301 



21-6 



177 











> j 



»j 



s > 



nos. 11 — 16 





12-5 



19 "3 



287 



200 



I7-4 











» > 



5 9 



> > 



nos. 17 — 22 



• • 



16-6 



197 



28-0 



I7-5 



i6-5 



In specimens nos. 17-22 the chelipedes are equal, or nearly so, and there are no 

 tubercles on the fingers. In nos. 17 and 18 an inconspicuous pubescence, sparse and 



