34 



FISH GALLERY. 



parietals and the squamosal (sq) ; the latter is a mallet-shaped 

 bone, the basal extremity of which is in contact with a small bone, 

 the quadrato-jugal (qj), which represents the quadrate and jngal 



Fier. 23. 



Skeleton of Bona esculenta. 



of higher Vertebrates ; there are then two premaxillce (pm) and 

 two maxilla (mx), bearings in certain species, closely-set, small, 

 acute teeth. On the lower surface we distinguish the vomers (vo), 

 each of which bears sometimes a group of teeth, the palatines (pi), 

 horizontal, rod-shaped bones, the ethmoid (e), a large T-shaped 



