CEPHALOPODA. 



217 



three days she fed them with naked or testaceous 

 Mollusca. She describes the Poulpe, as " furnished 

 with eight arms, hating on each two rows of suck- 

 ers ; the first two arms more robust, serving as masts 

 to support the sails, which being spread out, act be- 

 fore the wind as such. At the base, they have, on 



THE PAPER NAUTILUS (Argonauta Aryo). Fig. 1, Swimming to- 

 wards the point a; 2, walking on the bottom ; 3, contracted within the 

 shell, which is partly embraced by the arms. 



the inferior side, a double row of suckers like the 

 other six : but from the inferior row, about one inch 

 from the base in adults, a furrowed membrane 

 begins to develop itself, which extends to the tip of 

 the arm, and, holding it bent, it can no longer 

 execute the office of a rowing arm, but is employed 

 by the animal as a sail. These sails are so large, 

 that, when turned backwards and pressed against the 



VOL. II. L 



