SURFACE COPEPODA OF THE GULF OF MANNAR. 



195 



+ 



+ 



+ 



Undinula vulgaris. 



Left Furca. 

 ^ ^ 



4 3 2 1 



+ 

 + 



+ 



Eight Furca. 

 A 



• + 



+ + 



. + 

 + + 



+ + 



+ + 



+ + 



+ + 



• + 



• + 



+ . 



. + 



+ + 



• + 



• + 



+ + 



+ + 



+ + 



+ + 



+ + 



+ + 



. + 

 + + 



+ 



+ 



+ 



+ + • 



+ + + 



+ + . 



+ . 

 + + 



. ■+ + 

 + + + 



+ 

 + 



+ + + + + 



+ + 

 + + 

 + + 



+ + 



+ + 



+ 

 + 



+ 

 + 



+ 



Number of 



times each ^4 jg 15 li 



affected 



4 



+ 



+ + . . 



+ + + + 



+ + + + 



. + + 



+ 



+ + + + 

 + 



+ 

 + + 



+ + + 



+ 



+ 



+ + + + 



+ + + + 



. + • 



+ + • 



18 15 20 14 10 



5 ® eo 



, S CO ^ 



/ bC O ce 

 (3 +5 

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 ©(DC 

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o 

 u 



I 

 a 



u • 

 P-i SB 



ft 



02 



O ra 4) i, 03 *3 Ai 



►^ ^. Qi ,*» D Jl5 <U 



«s 



From the above it is evident that there is little or no 

 regularity in the disposition of the plumose setae in any 

 particular individual, in some cases only a single hair showing 

 this change, in others all ten doing so ; it is quite exceptional 

 to find any attempt at symmetry in the arrangement. It will 

 be noticed that in the number of individuals affected, the 

 proportion of females is larger than that of males, but a 



