OF THE riEAD IX THE BATIIACIIIA URODELA. 



Text-lig. 46. 



113 



mf.' 



mt. 



Similar reconstruction of the more dorsal region of the same embryo 

 as in text-fig. 45. 



Text-fiff. 47. 



ocp. mds 



JJeft side view of a reconstruction of an embryo 5 mm. long. The cavities of the 



gill-pouches are shown in black. The auditory sac is a thickening directly 



\"' -continU-ouswith'the'epiblast.- Dots indicate epidei-malthickertings. .■ i-.^'- 



Proc. Zool. Soc— 1911, No. YIII. 8 



