PLATE 3 



EXPLANATION OF FIGURES 



79 A section posterior to the one in figure 78, I., small independent lenses; 

 o.p., olfactory pit; in., mouth. X 90. 



80 Photomicrograph of a transverse section through the anterior part of the 

 head of the embrj^o in figure 20. br., brain; I., lenses; y., yolk. X 135. 



81 Photomicrograph of a sagittal section through the meroplast in figure 

 38. br., brain fragment; I., lens; r.c, rods and cones; I.e., lymphocytes; y., yolk; 

 pi., plasma. X 64. 



82, 83, 84 Photomicrographs of transverse sections through embryo with 

 'isolated eye' (fig. 42), br., brain; e., eye; /., lens; y., yolk; r.c, rods and cones; 

 o.g., oil globules. Figures 82 and 83 X 70. Figure 84 X 80. (The right side 

 of figures 82 and 83 corresponds to the left side of figure 84; due to reversion 

 of prepai'ation in photographing.) 



85, 86, 87 Photomicrographs of transverse sections through amorphous em- 

 bryo in figure 30, a, brain component a; b, brain component b; I., lens; pi., plasma; 

 i., intestine; o.c, optic cup; c.d., notochord; sp.c, spinal cord; y., yolk. X 116. 



88 and 89 Photomicrographs of transverse sections through amorphous em- 

 brj'o in figure 31, e.v., ear vesicles; m., muscles; i.. intestine;/., fin; pi., plasma in 

 oedematous cavity of fin; y., yolk. X 120. 



582 



