All 
Fig.l6. / 
A B \\ ml 
: NY op. 
Fic. 16.—Diagrams of the nervous system (see page 508); 4 B, of 
-  Buthus (Scorpion), after Newport. C, of Limulus, constructed from 
Milne-Edwards. I to VI, nerves to the cephalo-thoracic limbs; VII, 
nerve to the genital operculum; VIII to XII, nerves to the lamelli- 
gerous appendages, of which all arise from the ventral cord in Limu- 
lus; whilst VIII, IX, and X are, as it were, drawn up to the cwsopha- 
geal collar in Buthus. oc, nerve to the compound or grouped eyes ; 
oc’, nerve to the simple eyes; Z‘ to L*, position of the four respiratory 
appendages of the left side of the Scorpion; g, rectal ganglia of 
Limulus ; sp, nerves to the post-anal spine. 
