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EXPLANATION OF PLATE XII. 



Fig. 1. A portion of the lower part of the lung of a Chameleon, exhibiting the 

 arrangement of the capillary blood-vessels. 



Fig. 2. The blood-vessels of the upper compartment of the air-bladder of the Eel. 



Fig. 3. The blood-vessels of the interior of the air-bladder of the Cod-fish, (Gadus 

 morrhua). 



Fig. 4. The blood-vessels of the lower compartment of the air-bladder of the Eel. 



Fig. 5. The parallel arrangement of the blood-vessels in the interior of the air- 

 bladder of the Pike, (Esox lucius). 



Fig. 6. The vessels of the lower part of the lung of the Chameleon, (part of fig. 1), 

 magnified fifty diameters, showing the similarity of arrangement between 

 them and those of the Eel in fig. 2. 



EXPLANATION OF PLATE XIII. 



Fig. 1. The air-bladder of the Eel, natural size. 



a. Upper compartment. 



b. Lower compartment. 



c. The opening of the upper compartment, as seen in the pharynx. 



d. The two glandular bodies. 



Fig. 2. The arrangement of the vessels in one of the glandular bodies, (magnified 



twenty diameters). 

 Fig. 3. One of the glandular appendages to the large trunks in the gland of the 



air-bladder of, the Cod-fish. 

 a. Looped termination of the capillaries. 

 Fig. 4. A cluster of the same, in various positions, exhibiting the looped termination 



of the vessels. 



