142 GEO. S. HUNTINGTON 
7. D* may arise from the angle formed by the stembronchus 
with the origin of V”. 
8. D* and V“ may arise by a short common segment from the 
stembronchus. 
9. D* may default entirely. 
Fig. 5 Schema of variation in origin of the dorsal bronchi in relation to the 
stem and the ventro-lateral primary branches. Vy., proximal ventro-lateral 
bronchus; Vz., distal ventro-lateral bronchus; Dz., corresponding dorsal bronchus. 
This comprises the substance of Narath’s comparative ana- 
tomical evidence for regarding the dorsal bronchi as derived 
phylogenetically from the corresponding ventral bronchi. He 
lays stress on the fact that they show a general resemblance to 
certain of the side branches of the ventral bronchi, that they often 
arrange themselves in series with them, corresponding in size, 
manner of division and direction, and that they appear so to 
speak to be ‘‘in a way related to them”’ (33, p. 341). 
