166 
MR. TOYNBEE ON THE STRUCTURE OF 
Explanation op the Figures. 
PLATE III. 
Fig. 1, The epidermoid layer having been removed by maceration, the two fibrous 
laminee and the mucous membrane are seen partially separated by dissection. 
(Natural size.) 
Fig. 2. The tubular cul-de-sac formed by the epidermis lining the external meatus ; 
the inner extremity corresponding with the membrana tympani is convex. 
(Natural size.) 
Fig. 3. The radiate fibrous lamina of the membrana tympani ; the fibres of which it 
is composed extend between the cartilaginous ring and the malleus, with 
the exception of the uppermost fibres, which are not inserted into the 
malleus. (Slightly magnified.) 
Fig. 4. The external surface of the membrana tympani, the epidermoid layer having 
been removed ; the upper part of the membranous meatus is seen to be con- 
tinuous with a membrane covering the upper and outer surface of the radiate 
fibrous lamina. [This membrane is the dermoid lamina of the membrana 
tympani ; it is described in the Appendix to the paper as covering the whole 
of the outer surface of the radiating fibrous lamina.] 
Fig. 5. The fibres composing the radiate fibrous lamina. (Magnified about 300 
diameters.) 
Fig. 6. The radiate fibrous lamina, external surface displaying the peculiar markings 
caused by the interlacement of the fibres. (Magnified about 300 diameters.) 
Fig. 7- The radiate fibrous lamina after having been treated with acetic acid. 
Fig. 8. The circular cartilaginous band after having been treated with acetic acid. 
Fig. 9. The external surface of the circular fibrous lamina ; the fibres being attached 
to the processus longus of the malleus. (Slightly magnified.) 
Fig. 10. The internal surface of the circular fibrous lamina ; the long process of the 
malleus is seen through the translucent central part. (Slightly magnified.) 
Fig. 11. The fibres composing the circular fibrous lamina. (Magnified about 300 
diameters.) 
Fig. 12. The circular fibrous lamina after being treated with acetic acid. 
Fig. 13. The radiate fibrous lamina, the circular fibrous lamina and the mucous 
membrane of the membrana tympani seen to be continuous with other 
structures. (Slightly magnified.) 
Fig. 14. The attachment of the incus and malleus, illustrative of the movements of the 
incus, malleus and membrana tympani. 
Fig. 15. The attachments of the tensor tympani ligament; the tendon of the tensor 
tympani muscle is drawn upwards so as to expose the ligament. 
Fig. 16. The insertion of the tensor tympani muscle and its attachment by strong 
ligamentous fibres to the inner part of the base of the cochleariform pro- 
cess. 
