ON THE LUNG OF THE OPOSSUM. 



BY 



JOHN LEWIS BREMER, M. D. 



From the Emhryological Laboratory of Harvard Medical School. 



With 11 Text Figukes. 



The lung of the new-born opossum in the pouch shows peculiarities, 

 already partly described by Selenka, which make it appear tliat respira- 



FiG. 1. Opossum, 10.5 mm. trans. Series 614, No. 305. Ao, aorta; oc.s, oesoph- 

 agus; «M, auricle, ren, ventricle of heart; pr., new bronchial bud. 



tion is carried on in specially modified bronchi and bronchioles before 

 the infundibular portion of the lungs is developed. Selenka's descrip- 



A.MERicAN .Journal of Anatomy. — Vol. III. 



