BAL^NOPTERA. 



55 



45. Bronchi dissected out of the lung of the fadus of the 



Longniddry B. sihhaldi. The method of branching, 

 the cartilaginous rings, and the large bronchial nerves 

 which ramify on the wall of the tube and its branches 

 are shown. 



46. Moniliform tube. A portion of the intestine of the Long- 



niddry B. sibbaldi ; parallel and next to the mesenteric 

 border is the moniliform tube, external to which is 

 the superior mesenteric vein. The thickness of the 

 wall of the tube and the constrictions on the surface 

 are shown in the figure. See Turner's description in 

 Trans. Boy. Soc. Edin., vol. xxvi., 1870, for probable 

 relations to mesenteric arterial system. See figure 

 below. 





47. Omentum, portion of, from the Longniddry B. sibbaldi, 



showing its beautiful reticulated character. 



48. Aorta. Transverse section through the thoracic aorta of 



the North Berwick B. sibbaldi 78 feet long. The 

 transverse diameter of the lumen is 9| inches ; the wall 

 in the fresh state was 1 f inch thick. The section was 

 taken about 3 feet from the origin of the aorta. 



Knox Collection, No. 18. 



49. Pulmonary artery showing a much thinner coat than the 



aorta. A single semilunar segment of the valve. 

 From a large IJorqual, the North Berwick B. sibbaldi. 



Knox Collection, No. 21. 



