206 



THE develop:\iext of the chick 



ceri^/7. 



MM Oj?MJ//^ /s/A 



Fig. 117. — Entire embryo of 35 s, drawn as a transparent object. 



a. a. 1, 2, 3, 4, First, second, third, and fourth aortic arches. Ar., 

 Artery. A. V., Vitelhne artery, cerv. Fl., Cervical flexure, cr. Fl., 

 Cranial flexure. D. C, Duct of Cuvier. D. V., Ductus venosus. 

 Ep., Epiphysis. Gn. V., Ganfjlion of trigeminus. Isth., Isthmus. 

 Jug. ex., External jugular vein. Md., Mandibular arch. M. M., 

 Maxillo-mandibular branch of the trigeminus, olf. P., Olfactory pit. 

 Ophth., Ophthalmic branch of the trigeminus. Ot., otocyst. V., 

 vein. W. B., Wing bud. V. c. p., Posterior cardinal vein. V. 

 umb.. Umbilical vein. V. V., Vitelline vein. V. V. p.. Posterior vitel- 

 line vein. 



