220 



AN ELEMENTARY TEXT-BOOK OF BIOLOGY. 



The labyrinth is filled with clear endolymph, in which are sus- 

 pended, especially near the sensory patches, a large number of 



\o 



a 



y 



Fig. 63. DIAGRAMMATIC HORIZONTAL SECTION OF MAMMALIAN EYE 

 (from Landois and Stirling). a, Cornea; 6, conjunctiva; c, sclerotic; 

 d, external chamber, with aqueous humour; e, iris; /,/', pupil; h, lens; 

 ky junction of cornea and sclerotic ; m, choroid ; n, retina ; o, vitreous 

 humour; .A^o, optic nerve; q, nerve sheath; p, nerve fibres, piercing 

 outer coats and becoming continuous with retina. 



calcareous otoliths. It is lined throughout by simple epithelium, 

 mostly squamous, but in eight sensory patches, largely made up of 



