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BRITISH COPEPODA. 



antennae of the male, too, are very much less 

 specialised than in the true Cyclopidse, and one is 

 tempted to query whether this may not be a slight 

 degree of that retrograde development which is so 

 conspicuously shown in the lower parasitic Crustacea, 

 where the males have become little more than mere 

 sperm-sacs. 



This family is here represented by the genera 

 Notodelphys, Doropygus, Botachus, Notopterophorus, 

 and Ascidicola. 



Synopsis of Genera of Notodelphyidce. 



Sub-family 1. NOTODELPHYIN^E. 



Body flattened, head consolidated with the first 

 thoracic segment ; six abdominal segments in both 

 sexes. Anterior antennae 10 15-jointed, and in the 

 male adapted for clasping, as in Cyclops. Caudal 



