Tom VEINS SAVE 
—— ee 
(Cf ppiee 
- —--VC Mins: 
y----V.c.m. 
==——WAlapelel 
Seay Cs 
Fig. 4. The cephalic veins of Tropidonotus natrix, total length 59 cm. 
Dorsal view. X 9. 
c. e., external secondary anastomosis between the vena cerebralis media and 
