166 Ptib. Puget Soiind Biol. Sta. Vol. 2, No. 44 



PLATE 21 



a , first antennae. 



ah, abdomen, 



a.f, attachment filament. 



c, cephalon. 



e , trijjartite eye. 



I, lateral muscles 



m, dorsal muscles. 



m , muscles operating first pair of swimming feet. 



m' y muscles operating second pair of swimming feet. 



m'", dorsal abdominal muscles. 



ih, thorax. 



y, yolk globules. 



Fig. 1. Dorsal view of first copepodid larva. X173./>. 



Fig. 2. Mouth tube. X347. 



Fig. 3. Mandible. X347. 



Fig. 4. First antenna. X347. 



Fig. 5. Second antenna. X347. 



Fig. 6. First maxilla. X347. 



Fig. 7. Second maxilla. X347. 



Fig. 8. Maxilliped. X347. 



Fig. 9. Right swimming foot of first thoracic segment, showing 

 exopod with four setae, and endopod with seven setae. 

 X347. 



Fig. 10. Right swimming foot of second thoracic segment, show- 

 ing expodod with four setae, and endopod with six 

 setae. X347. 



