494 



WILLIAM A. LOCY AND OLOF LARSELL 



seen from surface views of untreated embryo lungs. Figure 41 

 represents the condition at the age of ten and one-half days. 

 The small circles in the middle of the dorsal area represent end 

 views of the dorsobronchi and their subdivisions. At the pos- 

 terior and lateral parts of the circular area are several dorso- 

 bronchi curved in such a way as to show other side walls. Ob- 



Lat.mo.. 



Fig. 41 View of the dorsal surface of the right lung of an embryo of the ten 

 and one-half day stage, showing the area at which the dorsobronchi reach the sur- 

 face. Also recurrent bronchi from the abdominal and posterior air-sacs. 



viously these do not belong to the ectobronchial system, branches 

 of which surround the central patch of dorsobronchi. 



In adult stages, as ( 'ampana has pointed out, the parabronchi 

 of the dorsobronchi form a network wnich he calls "reseau bron- 

 chique superficial de la face externe," covering precisely the 

 mass of parabronchi of the smaller dorsobronchi. The dorso- 

 bronchi have longer parabronchi that reach the surface and 

 shorter ones distributed to the interior of the lung. 



In Wood's metal casts of the adult (fig. 45) the reseau anasto- 

 motique shows as an easily identified anatomical landmark. 



