50 Cases--Includes 10 cases associated with important cardiovasclar defts.

32 Cases--Includes 6 cases assoicated with important cardiovascular defects.

9 Cases--Ostium of coronary sinus closed. No associated cardiovascular defects.

7 Cases--Left superior vena cava enters left atrium directly, Rt. s.v.c enters Rt. atrium as usual. All cases have important associated cardiovascular defects. Anastomosis-variable.

8 Cases--Type resembling embryonic sinus venosus, a common ante-chamber receiving both sup. venae cavae, inf. vena cava and Lt. sub-heptic v. All cases have important associated cardiovascular defects. Anastomosis-variable.

3 Cases--Presistence of drainage of a small left hepatic vein as in the left horn of the sinus venosus. No associated cariovascular defects. Great cardiac v. empties into Rt. atrium.

1 Case--Incomplete septation between orifices of inf. vena cava and coronary sinus. cornary veins empty coronary sinus and caudal protion of Lt. superior vena cava.

1 Case--Incomplete septation between orifices of inf. vena cava and coronary sinus. Coronary veins empty coronary sinus and caudal portion of Left superior vena cava.

24 Cases--Includes 2 cases associated with poten foramen ovale, all other cases have no associated deftes.

3 Cases--Show Rt. s.v.c. as an obliterated cord-like remnant.

3 Cases--Left superior vena only, enters left atrium directly. All cases have important associated cardiovascular defects. Pulmonary veins enter left atrium in 2 cases, not specified in one case.

3 Cases--Left superior vena cava only, enters a common atrial chamber directly. All cases have associated ventricular septal and vescular defects.

3 Cases--Lt. s.v.c. receives totl pulmonary drainage and enters Rt. atrium. All cases have IA defect. One cases also has IV defect.

2 Cases--Lt. s.v.c. receives total pulmonary drainage andenters Lt. atrium. All cases have IA defect, one case also has IV defect.

2 Cases--Rt. atrium receives total pulmonary drainage. Both s.v.c. enter Rt. atrium. All cases have IA defect (questionably functional in one case). One case also has IV defect.

2 Cases--Rt. atrium receives total pulmonary drainage. Lt. s.v.c. enters Lt. atrium. One case is true situs inversus. IA and IV defects.

2 Cases--Rt. s.v.c. receives total pulmonary drainage. Embryonic sino-strict arrangement. One case shows persistent Lt. sub-hepatic v. IA and IV defects.

1 Case--Lt. s.v.c. retotal pulmonary drainage. Embryonic sino-atrial arrangement. IA and IV defect.

6 Cases--Total pulmonary drainge directly into sino-atrial chamber. Embryonic type. All cases have IA and IV defects.

1 Case--Lt. s.v.c. receives total pulmonary drainage and enters common atrium. Biocular heart.

3 Cases--Partial persistence. Lt. s.v.c. receives total pulmonary drainage. all cases have IA defect.

1 Case--Partial persistence. Lt. s.v.c. receives partial pulmonary drainage (Lt. upper lobe) IA defect.

1 Case--Lt. atrium receives total pulmonary drainage and Lt. s.v.c. IA and IV defect.

1 Case--Lt. atrium receives total pulmonary drainage except Rt. upper lobe v. which enters Rt. s.v.c. IV defect.

2 Cases--Both atrial receive total pulmonary drainage. Both s.v.c. enter Rt. atrium. IA defect.

1 Case--Lt. atrium receives total pulmonary drainage and Lt. s.v.c. IA and IV defect.