PLATE V. 



PLA.TYG0BIO COMMUNIS Gill. 



Fig. 1. Side view of fish, sliowiug tlio small size of the huail, the large .scales, and the form and position of the fins 



especially the relative position of tlie dorsal and ventral fins. (The candal pednucle is represented too 



slender.) 

 Fig. 9. The body as seen from above, showing the broad head. (The head does not diinini.sh in breadth so rapidly 



before the eyes as reiireseuted in the fignre.) 

 Fig. 3. The head as seen from beneath, to .show the isthmus separating the lips .and the width of the isthmus dividing 



tlie branchial apertures. 

 Fig. 4. The pharyngeal bones. 

 Fig. b. The pharyngeal bone of the right side, to exhibit the grinding-snrfaces of the teeth. 



