Charles F. W. McClure — 169 
Fig. 5, Plate XV), anastomose with the postcardinals, give off branches 
to the mesonephroi and receive tributaries from the tissue ventral to the 
aorta. 
LACERTA 
LACERTA 
PRECARDINAL -- 
PRECARDINAL --~ 
_ 2POSTCAVA 
SUBCLAVIAN 
SUBCARDINAL. - -4 oo 
ANT. REVEHENT 
SUBCARDINAL 
HEPATICO-SUBCARDINAL __ 
JUNCTION 
SUBCARDINAL ~-Z&- 
SUBCARDINAL’ ~~ =**VENOUS RING 
OMPHALO-— 
RIGHT . 
25 “MESENTERIC 
POSTCARDINAL ARTERY 
POSTCARDINAL---- 
SUBCARDINAL - = 
SCIATIC 
CAUDAL CAUDAL ~-~- 
RiGee BGs 
LACERTA 
RIGHT . 
ANT. REVEHENT. —’ --“~---PRECAVA 
ae - POSTCAVA 
HEPATICO-SUBCARDINAL 
JUNCTION -. __ 
LEFT 
PARS SUBCARDINALIS- -= 
CROSS ANASTOMOSIS - = 
POST. REVEHENT -- 
ANT, REVEHENT 
---POST. REVEHENT 
POSTCARDINAL- - 
SCIATIC 
CAUDAL - - 
Fi1a. 3. 
Fics. 1, 2 and 3. Diagrams illustrating the development of the veins in 
Lacerta. After Hochstetter. 
At a certain period of development the subcardinal veins of birds 
(chick, ninety hours) and the rabbit (twelve days and twelve hours) 
have recently been shown by Miller (03, Figs. 1 and 4) and Lewis (02, 
12 
