THE SEPIA. 275 
than fifty were gathered, but even bolted right over the entire 
breadth of the vessel, like a sportsman over a five-barred gate. 
Finally, the fin-like expansion of their mantle renders the 
nimble decapods good service in swimming. In the Sepias this 
Sepia. 
5. Finny membrane running along the sides of the body. c. Arms with four rows 
of suckers, d. Elongated retractile tentacles. e. Eyes. 
finny membrane runs along the sides of the body, while in the 
Calamary it forms a kind of terminal paddle. 
It might be supposed that the dibranchiate cephalopods, by 
their swiftness, their arms, and their powerful jaws, were suffi- 
ciently provided with means of attack or defence ;‘ but it must 
