DEVELOPMENT OF LYMPHATICS IN ANURA 65 
its posterior margin, but in its course it curves dorsally, that is, 
centrally or inwardly, and, closely associated in position with 
the external jugular vein, passes back along the heart towards 
temp.si.mox. 
prim. 
Ly 
hy. 
rg 
eq 
Wf 
ef) 
or|\ 
Hy 
Ff 
RY 
* iy 
a. 
‘al 
aN 
= 
ae ; 
\ oe NS f Be t ee rs 
Be B V4 }S si. FX. prim eae 
Weed i oe pericord. gf | ae 
MT Aa i Si.ven. 31.MOX. Pa y" ie 
*% 4 S ae oa i ke 7 SE fy sy ay 
\ ~ cs ; 
AUC a mG I AY ‘ 
Maar 7 lh : é Z 
eS aa 2 int. 
ia ; da WW ig 
ee 4 
SOG ae ae KE 
r ae q A ae 
Le oe a SE 
NA Low pete ~N 
GA Oe ens SS 
oe é4 ripe SS 
: 2s 23 PS — 
wa oe it renee 
8 SI 8 oP? 
SS ae 
Fig. 3 Same, at the level of the auditory capsule. X 50. temp. and peri- 
card. st. max. prim., temporal and pericardial divisions of the primary maxillary 
sinus; v. jug. int. and ext. dex. and sin., venae jugulares internae and externae 
dextrae and sinistrae; sz. ven., sinus venosus; cav. phar., cavum pharyngeus; cav. 
bran., cavum branchialis; int., intestinum; coel., coelom. 
the sinus venosus and thence makes a broad sweep outward 
along the duct of Cuvier to join the hinder end of the temporal 
sac. 
