520 PROFESSOR E, RAY LANKESTER,. 
Fic. 4.—Cephalothoracic appendages of Scorpio (left), and of Limulus 
(right), drawn from the object. cov, coxa. s¢e, Sternocoxal process of 
the coxa. epe. Epicoxite. ea’. Exite of the coxa of the sixth ap- 
pendage of Limulus. en’. Endite of the fourth segment of the same 
limb. a, 4, c, d. Endites and exites of the fifth segment of same. 
en®, Endite of the sixth segment of the same. 
