\i: i 1 1. 



the :iniiii;il is irritated. ;nnl 'jive it :i rather terocioiifi ap| 

 The-e U-anU are disposed ill M millet ric:i I | :it ! e| H-. upon the 

 dorvd -'irfacc. :in<l part iciilarly around tin- eyes, and their niiin- 

 l>er :iinl position form available dist im-t i \ c cha 



It will I.e readily understood. I'mm tin- above, tlinl 

 -<-;ncfl\ rlinr.-irtcristic <>\' spccio in ilu- cephalopoda, and Hint 



r;iiv i-s necessary to ^-p:ir:it' these siirt';icr rlrv.-il i<m>. which ni:iy 



In- (Mussidcrnl prrm.-niriit t'r -ii'-h :i> :uv due to llu- will of the 



:iiiiin:il. 'The littor.'il Species of Octopus, etc., which uniiiisirily 

 :iw:iit thrir prey, instrnd of piirsuinii- it like the linned pel.-i-i.- 



i. >ee)ll to possrss ;llld t'Xel'eisc. lo -mile r\lellt. ;i power of 



iiiiiniery. iii pri'\'-iitii|o- t heir \ iet inis from dist in- ni-hiiiL 1 

 them iVoin eireiini):K-eiit ohji-ets. 



Cartilages < ri<ii<- \). 



The e;irt il;iu'iiious supports of the principal ner\ c-unii^lia' ;nv 

 well-developed, sonu-t inies completely enveloping them: l-side> 

 which the prineip.-d organs of sense, the valves of the mantle, the 

 fms. i'tr.. are duly provided. 



A^ min'ht he expected from its Imbits. Uie ca rt ihi^iiiuiis system 

 of the Nautilus is the most simple of all the cephalopods. con- 

 sist inu of a well-developed head-cartilage, SO shaped and situated 



as to support the cesophageal ring, the cerebral and pe<lal com- 

 missures, whilst two prolongations of it serve the funnel or 

 siphon. 



In the dii>ranchiafa. unlike the Nautilus, the head-call ila^v 

 forms a complete ring around the (esophagus : from the- medial 

 line of the back of this rin^ spring two lancet-form rarlila^iinms 

 proei-xsfs. the cartilai:cs of the eyelid, and the under side of the 

 same rini;- spreads into a spoon-shaped process which comes far 

 forward and supports the eyes; pa rticula rly when, a^ in Sepia, 

 it reaches to the sides of the head and enemip:ixs t -> t he ocular 



opening. 



The cartilages of the lack andoi'ilu 1 tins are sho-,\ -\\ \\\ position 

 in I'hite l.li.ir. 1. after Keferstein. of S<-/, >//>. In t| u . 



Loliu'os thi- moon-shaped cartilage of the hack is wanting, luit is 



replaced in iis i'unciion> by the upper end of the corneous pen 



or inner shell. In the Odopod- there remains only of this i. 



