VISCERA. 



49 



VI. Viscera. 



A general sketch of the internal soft anatomy is 

 not attempted here. "We will merely indicate the prin- 

 cipal differences in the structure of the lungs and uro- 

 genital apparatus which are of special importance 

 from the point of view of the systematist. The 

 following figure will suffice to show the position and 

 relations of the various parts. 



Fig. 20. 



Longitudinal section through body of male Bana esculenta, 

 showing the viscei-a. 



a. Auricle of heart, i ig. Large intestine. 



ca. Adipose bodies. 

 cf. Bile-duct. 

 cL Cloaca. 



h. Liver. 



i. Small intestine. 



I. Spleen. 



la. Larynx. 



p. Lung. 



pa. Pancreas. 



r. Kidney. 



s. Stomach. 



t. Testicle. 



V. Ventricle of heart. 

 ve. Bladder. 

 vf. Gall-bladder. 

 vs. Vesicnla seminis. 



The lungs are a pair of sessile, or very shortly 

 pedunculate, oval sacs, often more or less pointed 

 posteriorly. Their walls are thick and spongy in 

 Bana, thin and diaphanous in the other genera. 

 Their periphery may be divided into numerous air- 

 cells, around which the ramifications of the pulmonary 

 artery are distributed, as in most genera; or the cells 

 may be few and the ramifications of the artery reduced 



