EPARTERIAL BRONCHIAL SYSTEM. 1-29 



I. Bronchial Tree with bilateral Eparterial Bronchus. 



a. Eparterial Bronchus on both sides bronchial in derivation: 



Bradypus, Equus, ElepJias, FJioca. 



b. Eparterial Bronchus bronchial in derivation on left side, 



tracheal on right : PJwaeua conwumis^ DclpJiinus 

 del p] lis, Atichenia. 



II. Bronchial tree with Eparterial Bronchus only on right side. 



a. Eparterial Bronchus bronchial in derivation : Monotrc- 



mata, Marsupalia, Edentata (except Bradypiis), Ro- 

 dentia (except Hystrix), Carnivora, Insectivora, Chi- 

 roptera, Prosirnice, Primates. 



b. Eparterial Bronchus tracheal in derivation : Artiodactyla 



(except Camelus and Ai-teheiiia), many Cetaceajis 

 {Epiodon australe, Hyperoodo7i rostrat74S, BalcEuoptera 

 rostrata and sibba/dii). 



III. Bronchial tree without Eparterial Bronchus. Bilateral hy- 



parterial system : Hystrix cristata, Balcena viysticetus 

 and antipodnm. 



IV. Bronchial tree with triple division of Trachea into three 



unequal Bronchi : Pontoporia blainvillei. (Isolated 



type — not found in any other mammal.) 

 The above postulates comprise, I believe, the main results of 

 Aeby's research as far as they concern the subject of the 

 present communication. They have been, as already stated, 

 almost universally adopted and have found place, as recognized 

 anatomical facts, in the majority of current text-books on human 

 and comparative anatomy. 



Among the subsequent contributions to the morphology of 

 the bronchial tree one deserves special mention, on account of 

 its importance and because it appears to me that it has not re- 

 ceived the attention which it deserves. Albert Narath, in 1892, 

 presented a communication to the " Anatomische Gesellschaft," 

 entitled " Vergleichende Anatomic des Bronchialbaumes," pub- 

 lished in the " Verhandlungen d. Anat. Gesell. VI. Versamm- 

 lung, 1892." In this paper Narath controverts a number of 

 Aeby's conclusions very forcibly. 



