A. 



E. 



A. = anterior view of 1st post-oral cephalic arthrophragm. 



B. E. = anterior views of the left side of the following arthrophragm. 



B. 2nd post-oral cephalic arthrophragm. 



C. = 1st thoracic arthrophragm. 



D. = 2nd thoracic arthrophragm. E. = 3rd thoracic arthrophragm. 



(The parts are shaded as in Fig. 4). 



a. = junction of 2nd cephalic endopleurite with 1st thoracic endosternite. 



b. = point of fusion between 2nd thoracic endosternite and 2nd cephalic 



endopleurite. 



c. = line of fusion between 2nd thoracic endopleurite and 3rd thoracic 



endosternite. 



d. = point of fusion with the 1st thoracic endopleurite. 



e. = line of fusion between 3rd thoracic endopleurite and the 4th thoracic 



endosternite. 

 /. = line of fusion between 3rd thoracic endosternite and the 2nd 



thoracic endopleurite. 

 x. = point of fusion between the 2nd cephalic endopleurite and the 



2nd thoracic endosternite. 

 y. = point of fusion with 1st cephalic endopleurite. 



(The dotted line in Fig. D represents the 3rd thoracic endosternite.) 



