178 Pub. Puget Sound Biol. Sta. Vol. 2, No. 44 



PLATE 27 



a, first antennae. 



a", second antennae. 



bd, body of adult female. 



bu, bulla. 



d, digestive tract. 



e.s, eggs sacs. 



g, portion of gill. 



m.t, mouth tube. 



mx', first maxillae. 



mx", second maxillae. 



mx.g, second maxillary glands. 



mxp, maxillipeds. 



mxp.g, maxillipedal glands. 



r, reproductive organs. 



s.g, shell glands. 



sp, spermatophores. 



t, tube of attachment filament. 



Fig. 28. Immature female showing transformation of organs. 

 The copepod is still attached by the second maxillae 

 (mx") to the proximal foot of the attachment tubs (t). 

 The maxillipeds (mxp) can also be seen undergoing 

 modification. X90. 



Figs. 29 and 30. See plate 28. 



Fig. 31. Female nearly sexually mature with maxillipeds (mxp) 

 fastened in gill filament (g), while second maxillae 

 (mx") are creeping along attachment tube (t) in or- 

 der to attach themselves permanently to bulla. X68.5. 



Fig. 32. Maxilliped of female at time of attachment of second 

 maxillae to bulla. X 163.5. 



Fig S3. Maxilliped of male at sexual maturity. X 163.5. 



Fig. 34. Adult female permanently attached by its second 

 maxillae (mx") to the bulla (bu). X17.5. 



