526 PROFESSOR E. RAY LANKESTER,. 
Fa, 
Fic. 7.—The tenth, eleventh, and twelfth pairs of appendages of Scorpio 
(left), and of Limulus (right). The posterior face of the appendages 
is shown. stg. Parabranchial stigmata of Limulus. eps¢. Epistig- 
matic sclerites. /'. Mediad, or first lamella of the lamelligerous 
appendages. /130. External, or one hundred and thirtieth lamella of 
the same in Scorpio. /150. External, or one hundred and fiftieth 
lamella of the same in Limulus. Draw from specimens. It is important 
to note that in these and other figures the lung-books of the Scorpion 
are represented as entirely freed from the delicate pulmonary sac which 
invests them. 
