Charles F. W. McClure 171 
CHICK 
RIGHT 
ANT. REVEHENT 
_« POSTCAVA 
LEBR 
~-—-- ANT. REVEHENT 
CHICK 
“POST. VERTEBRAL 
HEPATICO- 
SUBCARDINAL 
SIGTIONS* = POSTOAVA -4>---- 
aes POSTCARDINAL semis *e 
SUBCARDINALIS ~~ OMPHALO- ANASTOMOSIS~. _ Sea ca FT 
ee =-- MESENTERIC : tetas PEBARENAE 
x GENITAL ~. 4 
CROSS ----a" ARTERY . 
ANASTOMOSIS 
POST. REVEHENT --# - ~ EXT. ILIAC EXT. ILIAC 
INT. ILIAC - ~ +GREAT RENAL 
SCIATIC POSTCARDINAL 
Fia. 4. 
RABBIT 
z POSTCAVA 
RIGHT 
ANT. REVEHENT ~~ {- - POSTCARDINAL 
HEPATICO-SUBCARDINAL 
JUNCTION -- -- LEFT 
ANT. REVEH 
PARS SUBCARDINALIS- - oe 
S : - OMPHALO - 
ROSS ANASTOMOSIS son 
Bee MESENTERIC 
POST. REVEHENT --- han 
POSTCARDINAL a 
Fic. 6. 
Fic. 5. 
RABBIT 
. 
AZYGOS - ‘ 
\ 
‘ 
AA 
an) 
7 at 
Ae 
‘ 
POSTCAVA__ \_ | is «Sau 
PARS ! 
SUBCARDINALIS - ¢° SUPRARENAL 
\ 
CROSS ANASTOMOSIS -€ 
TELE 
RIGHT RENAL 
RENAL 
SPERMATIC 
SPERMATIC -- i 
POSTCAVA-- ~~ 
POSTCARDINAL 
EXT. ILIAC 
Fic. 7. 
Fics. 4 and 5. Diagrams illustrating the development of the veins in birds. 
After Hochstetter and Miller. 
Fics. 6 and 7. 
rabbit. After Hochstetter and Lewis. 
Diagrams illustrating the development of the veins in the 
