\i i li i.i :->. \ i; \i - \ \ i> : 



re hit ion ID I In- habit nd e- of t he EtpeoieB ; 1 hus t he p< H-I;I. 



encountered only on tin- hi<_di sc.-is .-unl po--e--in^ tin- po\\er of 

 l;irt iiiu to -ome height :i bo\ e t In- \\ ater. :i re furnished with the 

 mo-l coriaceon- tin-; whilst (hose of the littc>r:il 'jeiiera :ire of :i 

 sul'ler consistence. Whilst the lms are of -ec< mi 1:1 ry importance 



as means of locomotion, they serve additionally as :i |>;n-:ieliute 



to preserve t he posit i on of t he body in 1 he water. Mini to vary I he 

 SMIIM- Mrj-iH-ilin^ to the desire o|' the :iniin:il ; llie'n- r:ipiil un<liil:i- 

 fcion, commencing I'roin the front or hind p:irt. :ie<-oi'din^ to the 

 direction in which the :iniin:d wishes to progress, is of course, of 

 ( si<|er:ille :iid ill li:i vii'M t i<>M. 



Tli' Anns :ire :it once or^.-nis of locomotion, either l>y 

 swiininiiii:- or cr:i \vliuu'. <!' touch :ind ol' ]>rehension. In tlie 

 telr:ilr;inclii;ites theynre multiplied in nnnilier l>nt reduced in 

 si/e .-nid st i-eiiotli, liein^ short, cylindrical, without cnpnles or 

 sucking disks, and retr.-ict.ile into two series of distinct s;icks ; in 

 the dihranchiMtes they :ire of delinile niiniher. n:imely /'///// 

 -es>ile or nttn-ret.rMctile :irms ; with the addition of I wo, 

 much longer, contractile, tentacular arms in some of the 

 and these are all provided with suckers or organs o!' prehension. 



Tin 1 arms of the octopods are longer, more Meshy and alto- 

 gether lietter adapted to their creeping; locomotion, and to reach- 

 ing out from their rocky hiding-places to seize the passing prey: 

 whilst the comparatively shorter arms of the decapods are coin 

 peusated ly the two. generally vei'y lar^'c, retractile l>'ntn<-l,'.~<. \ he 

 swimmini: memlirane, the more cylindrical narrow body, and the 

 stitfenin^ of the cuttle-hone or pen, in adapting tlu'in i'nr their 

 pelagic life. 



The internal faee of the arms is provided with sucking disk-, 

 or cups intended to retain objects with which they max be 

 brought in contact. The cups are sessile and fleshy only in tin- 

 octopods. and they are pedmiculated and then furnished with an 

 internal corneous riuii". armed with a serrated edir*' of with a 

 corneous hook in the decapods. 



In Kledoiie ami ( 'irroteiit his tin- sessile cupules occnp\ a 



le median line on the arms. whiNt in the other octopod 



genera they are in two parallel line-. In Octopus they a re 



infimdihuliform. -hallow, with a depiv-sed radiated snrfact . hi 



nauta these cup- are slightly narrowed at ihcir b.-ise. ;m d j n 



