PLATE 10 



EXPLANATION OF FIGURES 



Microphotographs of different structures in the anterior part of the eye as 

 seen in vertical section. Explanations: Bv, blood-vessels; C, cornea; Ca, car- 

 tilage of sclera; Cj, conjunctiva; Cm, circular muscles of iris; Cms, ciliary mus- 

 cles; Ep, epithelium of lid; F, feather follicle; LI, lower lid; I, iris; Ls, lymph 

 space; M, superior and inferior levator palpebrae; Mp, marginal plait of nictitat- 

 ing membrane; A'^, nictitating membrane; P, pigment in stroma of iris; Rm, 

 radial muscles of iris; Sp, scleral plates; T, tarsus of lower lid; Ul, upper lid; 

 Uv, uvea of iris; figures 60 to 66 indicate the portions represented in the enlarged 

 figures bearing these same numbers found on this and the following plate. 



57 Low-power view of vertical section through the lids, cornea, and iris, 

 showing the location of the enlarged figures represented by corresponding num- 

 bers. X 20. 



58 The upper lid and related parts. X 38. 



59 Lower lid and related parts. X 38. 



60 Margin of upper lid as indicated in figs. 57 and 58. X 250. 



61 Nictitating membrane showing its relation to lid and eyeball. Owing to 

 lack of distinction, the free margin of the membrane has been ^traced with ink. 

 X 250. 



62 A portion of the iris as indicated in fig. 57, showing the circular and radi- 

 cal muscles, blood-vessels, pigment, and uvea. 



454 



