112 GEO. S. HUNTINGTON 
symmetrical eparterial unfolding in both lungs is based on the 
very few prophetic remarks with which Aeby (2) concludes his 
main work on the mammalian bronchial tree. He there (p. 96) 
merely expresses the expectation that the contrast between the 
eparterial and hyparterial bronchial derivatives determined by 
Fig. 3 Aspidonectes spinifer, Le Sueur. Corrosion of right lung and pul- 
monary artery. Ventral view. Columbia Morph. Mus., no. 1931. 
him for the mammalia would be found in the reptilia represented 
by a transition into parallel longitudinal rows of bronchi, 
placed on the medial and lateral side of the pulmonary artery. 
Further suggestions along this line he considers unwarranted in 
view of his lack of material. 
Zumstein, one of the earliest investigators to analyze Aeby’s 
view critically, reported (89) on several reptilian lung corro- 
