PLATE 26 



EXPLANATION OF FIGURE 



Fig. 34 Photomicrograph of a transverse section of a fourteen-day steelhead 

 trout embryo, taken through the cardino-Cuvierian lymph sac (3'") found on 

 the left side and through the more anterior of the two cardino-Cuvierian lymph 

 sacs (3'") found on the right side of the embryo; see reconstructions o embryo, 

 figures 1 and 2. P. E. C. 696, slide 1, section 119; injected embryo. 



REFERENCES 



3'", Cardino-Cuvierian lymph sac; 6, Precardinal or jugular vein 

 anlage of the lateral pharyngeal lyrn- 14, Dorsal aorta 

 phatic which lies opposite to the car- 

 dino-Cuvierian junction 



126 



