514 PROFESSOR E, RAY LANKESTER. 
mencing with the tergal elements, we must necessarily refer 
simultaneously to the general disposition of the appendages. 
Cephalothoracic tergites—In Limulus (woodcut, fig. 1),% 
as in Scorpio (woodcut, fig. 2), the anterior region of the 
body is covered in by a large sclerite, which is known as the 
cephalothoracic plate or carapace. 
ro =f S<48e4 
oD 
> 
Fic. 2.—Outline of the tergal surface of a scorpion, Buthus Kochii (drawit 
from the object). oc’. Simple eyes (mesial). oc. Grouped eyes (lateral). 
P.A. Post-anal spine. The anus is on the sternal surface. 
In Limulus its margins are produced and its posterior - 
angles extended, so as to produce a form which differs from 
1 It is necessary to state once for all that where not otherwise expressed 
I always allude by the term Scorpio, or Scorpion, to the species Buthus 
Kochii, of India, which happens to have been that studied by me. Other 
species differ in trifling details from this. 
