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 



.^Vt.S'Yv 



L.sup. 



an.ch. 



L." 



L.f 



Schl. 



N.s. N.op. Vit. tu.v. Ret. Pig. L.inf. 



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. U , Outer layer 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 



