7 
Eyelids and Lachrymal Apparatus of Birds. 
contraction of the true lids their margins do not approach one an- 
other, and, indeed, rarely reach the sclero-corneal junction. 
the interpalpebral line of closure in small Birds is irregular, in- 
terrupted and wavy; nor are the two intermarginal spaces accurate- 
ly opposed to each other, as in Man. The Sparrow probably does 
not oppose more than one-half his lid-margin in the act of eye- 
closure, but shuts off his conjunctival sac from the outside world 
Fig - . 3 — Vertical Section Through the Anterior Part of the Eye of the 
Adult English Sparrow. ((Wood and Slonaker.) 
B. Briicke’s muscle; Bv, blood-vessels; C, cornea; Ch, chorioid; Cj, con- 
junctiva; Cm, circular muscles of the iris; Cp, ciliary processes; Cr, Cramp- 
ton’s muscle; Cs, canal of Schlemm; E, epithelium; F, feather follicle; IP, 
inferior palpebral muscle; L, lenticular portion of the lens; LI, lower lid; 
Ls, lymph spaces; M. Muller’s muscle; N, nictitating membrane; Ob, orbi- 
cularis muscle fibres of the lid; Pc, pars ciliaris retinae; Rm, radial muscles 
of the iris; Rp, ring-like pad of the lens; S, sclerotic; Scl, scleral plates; 
Sp, superior palpebral muscle; T, tarsus; U, uvea; Ul, upper lid. 
