PLATE 28 



EXPLANATION OF FIGURES 



Fig. 37 Photomicrograph of a transverse section of a twenty-three-day rain- 

 bow trout embryo, taken through the caudal end of the left subocular lymph sac 

 (1)', showing that the superficial facial (21) and lateral pharyngeal lymphatic 

 communicate with the subocular lymph sac at this stage of development; com- 

 pare figure 37 with figure 16. P. E. C. 968, slide 1, section 112. 



Fig. 38 Photomicrograph of a transverse section of a twenty-three-day rain- 

 bow trout embryo, taken through the left subocular lymph sac (/) eleven sec- 

 tions anterior to the point (fig. 37) where the superficial facial lymphatic (21} 

 communicates with the lateral pharyngeal lymphatic and the subocular sac. P. 

 E. C. 968, slide 1, section 101. 



REFERENCES 



1, Subocular lymph sac 21, Superficial facial lymphatic 



130 



