90 OTTO F. KAMPMEIER 
the manner in which it originates; but here, too, my observations 
are not in agreement with the views expressed by the above- 
named investigators. In Bufo embryos at least, it arises neither 
_ven-lym.com. jug . et lat. epi 
vias 
mye? 
~* 
myot. 
> “AE > “3 3 % y 
a 
v.card, post. ers d.proneph. | ye 
Fig. 16 Photomicrograph of a transverse section through the left anterior 
lymph heart region in a 5-mm. embryo of Bufo vulgaris (Ik. E. C., series B 44, 
slide 2, section 126). > 340. The line of demarcation and the difference of 
appearance between the cells of the myotome (myot.) and those of the lymph 
heart anlage (cor. lym. ant. sin.) is clearly expressed; ven-lym. com. jug. et lat., 
common segment of the jugular and the lateral line venolymphatics. Other 
references as in figure 15. 
as an evagination of the anterior vertebral vein nor as a direct 
expansion of a particular intersegmental vein, although it is 
conceivable how its appearance in certain developmental stages 
might lead to such suppositions. The readiest way of obtaining 
