ON THE GENERAL MORPHOLOGY OF THE MYXLNOID FISHES. 757 



Fie. 12. Dissection of the roof of the mouth of a 31 J cm. Hag, to expose the skeleton and muscles of 

 the pharyngeal velum. x 4. Mucosa, M. quadrato-palatinus, and both heads of the M. palato-coronarius 

 removed. The figure gives a ventral view of the structures shown. Hard cartilage, red ; soft cartilage, 

 blue. 



Fig. 1 3. Dissection from the left side of a 32 J cm. Hag, to illustrate the superficial anatomy of the 

 posterior portion of the M. constrictor branchiarum et cardiae. x 4. The body- wall, the efferent gill ducts 

 (so far as seen), cardiac corta, left anterior cardinal vein, inferior jugular vein, and vagus nerve have been 

 removed, whilst the definite ventral muscle bundles have been cut off short. The ligamentous sheet attach- 

 ing the ventral border to the body-wall is not shown. This figure should be compared with figs. 2 and 3. 

 For explanation of the numerals, cp. text. 



Fig. 14. Lateral dissection from the right side of a 34 cm. Hag, to illustrate the relations of an inter- 

 muscular septum, as found at about the middle of the body, x 3. The specimen was macerated, and the 

 muscle fibres picked off and brushed away. A = anterior, and D = dorsal. The numbers indicate the parts 

 of the septum from above downwards (see text). 



