48 Skates 



THORNY, CLEAR-NOSED, LITTLE, BIG SKATES 



I. A single row of thorn-like spines along the middle of 

 the back 

 Page 49, figs. A-C 



la. Mid-row thorns on tail considerably larger than 

 other thorns on tail 

 Page 49, figs. A, B 



See Thorny Skate, p. 262. 



lb. Mid-row thorns on tail about same size as other 

 thorns on tail 

 Page 49, figs. C, D 



See Clear-nosed Skate, p. 258. 



II. More than one row of thorn-like spines along the mid- 

 dle of the back 

 Page 49, figs. F, G 



Ila. Never more than 66 rows of teeth in upper jaw 

 Page 49, figs. E, F 



See Little Skate, p. 259. 



lib. Never less than 80 rows of teeth in upper jaw 

 Page 49, figs. E-G 



See Big Skate, p. 261. 



