ANATOMY AND METAMORPHOSIS OF CYCLOPS. 



235 



b. Around the mouth the three pairs of .appendages are 

 arranged. 



1. The first pair (-4), which become the first antennae 

 of the adult, are the smallest, and consist of three setose 

 joints. 



FIG. 127. 



FIG. 127. Nauplius. of Canthocaniptus Staphylinus, magnified five 

 hundred and seventy-five diameters. (From Hoek, Ent. der Entomo- 

 straken. Niederl. Arch. IV.) 



A. First antennae. An. Second antennae, a. Anus. en. Endopodite. 

 ex. Exopodite. L. Labrum. N. Mandible, o. Ocellus, s. Stomach. 



2. The second pair (An), which become the second 

 antennae of the adult, are much larger, and are the main 

 organs of locomotion. Each consists of a large setose 



