EMBRYO OF 24 MM. 



261 



cases they do not separate again until after birth, in which case the animals are 

 said to be " born blind." The ectoderm, EC, of the cornea describes a wide, high 



L.sup. 



N.I. N.op. 



L.inf. 



~ an.ch. 



Schl. 



FIG. 150. PIG, 24.0 MM. TRANSVERSE SERIES 62, SECTION 428. 



an.ch, Anterior chamber of eye. corn, Corneal mesoderm. EC, Ectoderm (epidermis). Ep, Inner epithelium 

 of cornea. Ir, Mesodermal anlage of iris. L' , Outer layefr of lens. L" ', Inner layer of lens. L.inf, 

 Inferior eyelid. L.sup, Superior eyelid. N.$, Oculomotor nerve. N.op, Optic nerve. Pig, Pigment 

 layer. Ret, Retina. Schl, Canal of Schlemm. tu.v, Tunica vasculosa lentis. Vit, Vitreous humor. 

 X 50 diams. 



arch, underneath which is a broad band of embryonic connective tissue, corn, 

 which forms the main thickness of the cornea. Between the connective tissue 



