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ABBREVIATIONS 



Au. G., Auditory ganglion. Ep., Epidermis. 



Au. G., I and II. First and second divi- Ep. PI. I, First epibranchial placode 



sions of the auditory ganglion. (epibranchial placode of the VII 



Au. Ves., Auditory vesicle. nerve). 



Br. I, II, III, IV, V, First to fifth bran- Ep. PI. II, Second epibranchial placode 



chial nerves. (epibranchial placode of the IX 



En., Endoderm. nerve). 



D. L. VII, Dorso-lateral portion of the Ep. PI. Ill, Third epibranchial placode 



lateralis VII ganglion. (first epibranchial placode of the 



D. L. M., Dorso-lateral mass. X nerve). 



