PLATE 9 



All figures magnified 18.8 diameters 



Fig. 5. — A pattern of the dorsal type of scale. At the top of the pattern 

 is a spinule and scattered over the surface in an orderly fashion are the second- 

 ary scales varying in size from the immature scale which has just erupted to 

 others which are of the Greek-cross form. 



Fig. 6. — A pattern of flattened scales of the dorsal type, taken from around 

 the spine of the dorsal fin. 



Fig. 7. — Supraorbital scales from the greatly exposed area over the eye. An 

 embryonic spinule is seen in the upper left-hand corner. ; 



Fig. 8. — Eepresents a transition from the dorsal to the ventral side over the 

 tip of the nose. Three areas of scales here appear. The one at the top of the 

 figure is of the dorsal scales; the next is made up of large transitional scales, 

 and the area at the bottom of the figure is of the ventral type. To the level 

 marked by X in the margins all of the scales have the direction of the spines 

 unchanged from that of the dorsal type, although the scales just preceding X 

 are under the nose. At the position X the spines change direction and point 

 backward. 



[166] 



