206 THE DEVELOPMENT OF THE CHICK 
Li Crk 
ae Gah as 
ae 
(his C7, A H 
Z Gig. K 
If WY eK AAW Z 
(ee 
SE a 
fp & a, ] 
ss Se 
Tia. 117. — Entire embryo of 35s, drawn as a transparent object. 
a.a. 1, 2, 3, 4, First, second, third, and fourth aortie eae Ar., 
Artery. A. V., ¥ itelline artery. cerv. Fl., Cervical flexure. wot ie 
Cranial flexure. D. C., Duct of Cavicn DV: Ductus venosia! 
Ep., Epiphysis. Gn. V., Ganglion 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., otoeyst.  V., 
vein. W. B., Wing bud. V. c. p., Posterior cardinal vein. V. 
umb., Umbilical vein. V. V., Vitelline vein. VY. V. p., Posterior vitel- 
line vein. 
