Apodal Fishes of Bengal, 205 



of the head and external branchial aperture, 

 2. the jaws and teeth ; a. the upper, b. the 

 lower jaw ; 3. a scale magnified ; 6. a portion 

 of the skin taken from the lateral line which 

 together with the scales on either side are 

 magnified about twice the natural size ; 4. the 

 outside of the branchial apparatus ; a. b. c. the 

 arches of the gills ; f. the branchial rays ; 

 g. the operculum magnified about twice; 

 5. inner view of the branchial apparatus ; a. b. 

 c. the arches ; d. entrance to the sack, e. h. 

 pharangeal teeth ; i.i.i. apertures between the 

 branchial arches. 

 PI. XIV. Internal structure of Apodal Fishes. 



I. The stomach, intestine, and heart in the ge- 

 nus Anguilla, Cuv. 

 II. The stomach, and air vessel in the genus 

 Murmnesox, J. M. 



III. The stomach, intestines, and heart in Ophi- 



surus, Lacep. 



IV. The same in the genus Strophidon, J. M. 

 V. The same in the genus Pneumabranchus, 



J. M. 

 VI. The same in Ophisternon, J. M. 

 VII. The same in Ptyobranchus, J. M. 



1, the stomach ; 2, the intestine ; 3, the entrance 

 to the throat ; 4, the anus, (5, Fig. V. and VI. 

 the liver) ; 6, the heart marking its relative 

 situation with the entrance of the throat. 

 7) the heart magnified, showing A. the auri- 

 cle, B. (and B. B. in some) the ventricle ; g. 

 the descending, and b c. the ascending vena 

 cava ; e. the ascending, and f. the descending 

 aorta, d. c. B. Fig. V. the muscular portion 

 of the ventrical, detached from the auricle, 



