274 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
EXPLANATION OF THE PLATE. 
Ao. 
Aorta. 
Abbreviations. 
Mnph. i. 
Inferior mesonephric vein. 
Au. 
Auricle. 
Port. V. 
Portal vein. 
Au. jD. 
Right Auricle. 
Si. 
Blood sinus. 
Au. S. 
Left Auricle. 
Sp. C. 
Spinal cord. 
bl. c. 
Blood corpuscles. 
St. 
Stomach. 
Card. 
Cardinal vein. 
Sup. rues. 
Superior mesenteric artery. 
Con. 
Connective tissue. 
S. V. 
Sinus venosus. 
D. cho. 
Ductus choledoclms. 
Um.V. 
Umbilical vein. 
Endo. 
Endothelium. 
V. C. I. 
Vena cava inferior. 
Ent. 
Entoderm. 
V. C. I. D. 
Vena cava inferior dextra. 
Ep. 
Epithelium. 
V.E. 
Eustachian valve. 
G. bl. 
Gall bladder. 
V. S. 
Valvula sinistra. 
Gin. 
Ganglion. 
W. B. 
Wolffian body. 
Jug. 
Jugular vein. 
W. I). 
Wolffian duct. 
