LIST OF ABBREVIATIONS USED IN ILLUSTRATIONS. 



A. B. S Arterial blood sinus. 



Ac. Fac. Gang. . Acusticofacial ganglion. 



All Allantois. 



Ant. Neur. Anterior neuropore. 



Ao Dorsal aorta. 



Ao. P Aortic process of sclerotome. 



At Atrium of heart. 



A. V. C Atrioventricular canal. 



B. A. 1 First branchial artery. 



B. A. 2 Second branchial artery. 



B. A. 3 Third branchial artery. 



B. B Bladder bay of cloaca. 



B. < ' Bulbus cordis of heart. 



B. P. 1 . First branchial pouch. 

 B. P. 2. .. . .Second branchial pouch. 

 B. P. 3 Third branchial pouch. 



B. Ph. M Buccopharyngeal membrane, with per- 

 forations. 



Br. U. A Branch of umbilical artery. 



B. S Belly stalk. 



Cav Cavity of somite. 



Cer. Hem Cerebral hemisphere. 



CI Cloaca. 



CM... . . . .Cloacal membrane. 



( <iel Coelom. 



I). A Dorsal aorta. 



I). ( ' ... .Ductus Cuvieri. 



Derm Dermatome of somite. 



Dien Dieneephalon. 



D. M . . . Dorsal mesocardium. 



D. R Degenerative remains of tubules. 



Eet Ectoderm. 



En . Endodenn. 



Fus. E Fusion of ectoderm to branchial pouch. 



Fus. N Fusion of notochord with cloaca. 



Gloss. Gang. . . Glossopharyngeal ganglion. 



Gr .Groove on cloaca marking rectum 



from bladder. 



H. c; Hind gut. 



Hyp. Hypophysis cerebri. 



1. C. A Internal carotid artery. 



I. C. M, Intermediate cell mass. 



Infund Infundibulum. 



I. S. A Intersegmental artery. 



L. B Liver bay. 



I.. 11 . . Left horn of sinus venosus. 



L. M. G Lower myotomic groove. 



L. U. A Left umbilical artery. 



L. U. V. . . . Left umbilical vein. 



MB Midbrain. 



Mes Mesenchyme. 



M. T Median thyreoid. 



M. V Mesonephric vesicles. 



My Myotome of somite. 



N. C Remains of neurenteric canal. 



N. Cd Nephrogenic cord. 



Neur. l-'J Nine neuromeres of hindbrain. 



Not Notochord. 



N. P Notoehordal process of sclerotome. 



Nr. Cr Neural crest. 



Nr. S. C Neuromeres of spinal eord. 



N. S Wall of central nervous system. 



Nt. Cn Notoehordal canal. 



Op. Ves Optic vesicle. 



O. V Otic vesicle. 



P. A. G Postanal gut. 



Pc Pericardium. 



Ph Pharynx. 



P. N Posterior neuropore. 



Pn. T Pronephric tubules. 



P. S Primitive streak. 



P. V. A Paired ventral aort*. 



R Remains of pronephric tubules. 



R. B Rectal bay of cloaca. 



R. H Right horn of sinus venosus. 



Rt. U. A Roots of umbilical artery. 



R. U. A Right umbilical artery. 



R. U. V Right umbilical vein. 



R. V. A . Right ventral aorta. 



Scl Sclerotome of somite. 



Som . . Wall of mesodermic somite. 



Sp. G Spinal ganglion. 



St Stomodseum. 



S. V . . Sinus venosus. 



Tr Trichter or nephrostome. 



Trigem. Gang. .Trigeminal ganglion. 



U. M. G Upper myotomic groove. 



U. V Umbilical vein. 



V. A Median ventral aorta. 



Vag. Gang Vagus ganglion. 



V. B. S Venous blood sinus. 



V. C. A . .Vena cardinalis anterior. 



V. C. M Vena capitis medialis. 



V. C. P Vena cardinalis posterior. 



Vent.. Ventricle of heart. 



Vit. A Vitelline artery. 



V. 0. 1 . . Vitello-umbilical trunk. 



V. V... Vitelline vein. 



\Y. I) Wolffian duct. 



Y. S Yolk sac. 



