HETEROGENY AND VARIATION IN COPEPODA. 



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I have not found a single Cyclops combining these characters. 

 The eleven-jointed antennae are, with one exception, so far as 

 my studies show, always correlated with tlire ^-jointed rami in the 



FIG. 4. Represents an eleven-jointed antenna, B, correlated with a two-jointed 

 fifth foot B' and short caudal stylets with very long, plumose setae, A. C and C f 

 represent an eleven-jointed antenna and a correlated one-jointed fifth foot with the 

 same abdomen and stylets as are seen in the form with the eleven-jointed antenna; 

 and the two-jointed fifth foot. 



swimming feet, and the armature of these forms is precisely like 

 that of C.phaleratus, whether the fifth foot be one-jointed or two- 

 jointed. The third species having eleven-jointed antennas which 



