SEGMENTS OF TRIGEMINAL NERVE-GROUP 269 



A. 



DOESO - VENTRAL MUSCLES ON 



Carapace of Scorpion. (From 

 Miss Beck.) 



E. 



Similar Muscles on Carapace 

 of Eurypterus. 



Similar Muscles on Head- 

 Shield OF A CEPHALASPID. 



I.e., lateral eyes ; c.e., central 

 eyes ; Fro., narial opening. 



62-65 refer to Miss Beck's cata- 

 logue of the scorpion muscles. 



Fig. 110. 



