458 C. W. PRENTISS 



LowENBERG, B. 1864 Beitrage zur Anatomie der Schnecke. Archiv f. Ohron- 

 heilk., Bd. 1. 



Retzius, G. 1884 Das Gehororgan der Wirbeltiere. Biologische Untersuchun- 

 gen., Bd. 1, Stockholm. 



RiCKENBACHER, O. 1901 Untersuchungen liber die cmbryonale JXIembrana tec- 

 toria der Meerschweinchen. Anat. Hefte, Abth. 1, Bd. 16. 



ScHWALBE, G. 1887 Lehrbuch der Anatomie der Sinnesorgane. 



Shambaugh, G. E. 1907 A restudy of the minute anatomy of the structures in 

 the cochlea, etc. Amer. Jour. Anat., vol. 7, no. 2. 



PLATE 1 



explanation of FIGURES 



Fig. 13 Microphotograph of an axial section through the cochlea of a 7.5 cm. 

 fetus. The numerals 1, 2, 3, indicate the turns of the spiral corresponding with 

 those similarly numbered in figure 14. X 20. 



Fig. 14 Microphotograph of a section through the modiolus of a cochlea from 

 an 18.5 cm. fetus. Turns of cochlea numbered on right as in figure 13. X 20. 



