PLATE 2 



EXPLANATION OF FIGURES 



71 Section through the region of the ear vesticles of the embryo in figure 8. 

 The semicircular canals are on both sides all fused into one, m.o., medulla 

 oblongata; -ph., pharynx. X 116. 



72 Photomicrograph of a part of a transver.se section through the head of 

 the embryo in figure 13 showing three small fused olfactory pits o.p. on the 

 deformed side, o.c, oral cavity. X 116. 



73 A section more posterior of the same embryo, n.e., the last part of the 

 noi'mal eye; r.e., rudimentary eye; o.p., one of the three olfactory pits on the 

 abnormal side; o.l., optic lobe. X 116. 



74 Photomicrograph of a transverse section of the embryo in figure 13, more 

 posterior to the section in figure 73. s.c.c, semicircular canals; o.l., optic lobe; 

 o.l.f., optic lobe fragment; h., heart. X 116. 



75 A transverse section of the embryo in figure 17 through the region of the 

 ear vesicles, h.e., heterotopic eye; s.c.c, semicircular canals; h., heart; I.e., 

 lymphocytes; y.s., yolk-sac. X 116. 



76 Photomicrograph of a transverse section through the posterior region of 

 the eye of the embryo in figure 16. o.c.f., blastolytic optic cup fragments; o.c, 

 oral cavity. X 116. 



77 Photomicrograph of a transverse section through the eye region of the 

 embryo in figure 15. o.c.f., blastolytic optic cup fragment; o.c, oral cavity. 

 X 116. 



78 Photomicrograph of a transverse section of the embryo in figure 14, show- 

 ing one normal eye, a dislocated olfactory pit, o.p., and an 'independent' lens, 

 I. on the maxilla, m., mouth. X 90. 



578 



