PLATE 6 
EXPLANATION OF FIGURE 
33. Reconstruction of the vascular channels and other structures in the 
region of the left pronephros in a 7-mm. embryo of Bufo vulgaris (IX. E. C., series 
B 27), lateral view. X 166. 
lym. jug., lymphatica jugularis; at the points marked * there is still a minute 
connection between the pronephric sinus and the lymphatic. 
temp. s. max. prim., posterior tip of the temporal division of the sinus maxil- 
laris primigenius. 
lym. lat., lymphatica lateralis; this lymphatic in early stages is broadly plexi- 
form and has a dorsal and a ventral division. 
cor. lym. ant., cor lymphaticum anterius; the surrounding lymphatics are 
severing connection with the heart; the lymphaticovenous junction is on the 
ventral surface of the heart, and anterior to this are two small venous branches 
which later become consolidated with it to form the anterior vertebral vein. 
v. jug. ext., vena jugularis externa. 
d. Cuv., ductus Cuvieri. 
gan. jug. (vag.), ganglion jugulare of the vagus group. 
Other structures as in the preceding plates. 
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