570 



CEPHALOPODA. 



to the nature of the shell of the Argonaut. The Poulpe that inhabits 

 the elegant abode represented in a preceding figure (fig. 283), when 

 removed from its testaceous covering, has the general form of an Oc- 

 topus. Its body (fig. 285) is enclosed in an ovoid muscular sac (d) ; 

 and the head is surmounted by eight long sucker-bearing arms, of 

 which six (e, f) taper gradually from their origins to their extremities, 

 while the other two, formerly regarded as sails, and which we shall 

 continue to designate by their ordinary name, vela, expand into broad 

 membranes (b). 



Fig. 285. 



Animal of the Argonaut out of its shell: a, the siphon; 6, the so-called vela; c, the head; 

 d, the body ; e,f, locomotive tentacula. (After Poli.) 



(1531.) M. Sander Rang, who, during a residence at Algiers, had 

 ample opportunity of studying the living Argonaut, ascertained that in 

 the figure copied from Toll, which we have given in a preceding page, 



