m. i 

 lentliis. EllOplotenthlS, Celjeno and Uelemnitcs have hooks. in 



ows; ami iii tin- two former there is additionally a uronp 



of SIHM|| cupules Mini tubercles at Ilic base \\hidi may In- n-ed lo 



form b\ the Mpposit ion of these parts in the two teiitacl. 



of lleshy articulation :nnl support for the action of tin* aimed 



clubs. Chiroteuthis has an additional oval fleshy copule at tin* 



t-\t remit y ol' tlic clul). 



'l'l)- welt which connects the :inns in inniiy <>!' the ce|h:ilo|H,<U 

 ni:i\ l>c likt-ned to MM trmln'i'lhi ol' \\hiclithe .-inns t licin-el\ es 



in:i\ i-c|, rocnt ihe ribs. It \^ \m\ lit t le dcvelo|ie.i in some genera, 

 inn Mtt.tins :m enormous development In Cirroteuthis, where it 



unites .-ill the nniis to ncMi'ly their tips; :nd in species of Tivin- 

 octopns it is onl\- develope<l l)et\v'en the dorsjil or snpefior :i rnis. 

 Tin* mod ilic:it ion ol' one of the ses>ile nrnis of t he male ( Vplinl- 

 opo<U for se\u;il pll rposes, en nsi no- it tonssiinie :i totnlly <liH'erent 

 :(ppc:ir:ince. \vill be niofe Mi|n)priMtrIy trnih-d under tn:rttal 



organs. 



In the tetrabranchiates, of which the Xnutilns is MII example. 

 the loot is repi'esented by ;i ^In'ii-lh. in the in:iru;iii of which :i re 

 digitations, eigbl in nuinbei'. :md IVoni these digitations project 



in :i double series, tliirly-^ix small unarmed brachial tentacle>, 

 lamellated <>n their inner surface, ami retractile at the will of the 

 animal. This sheath expands o-reatly dorsally. foniimu' a tri- 

 an-ular. t nbercnlate. lleshy hood, by which the aperture of the 

 shell may be closed in lieu of an operculmn. In addition to the 

 bracliial there ai'e other tentacles ; namely four irnnips of twelve 

 or thirteen each, termed laliiti/. and siirroiindin^ the lips, and 

 four ocular tentacles, situated one in front and one behind each 

 .and which appear to be organs of sensation. In the male 

 there is -..me modification ; the internal tentacnliferons lobe- 



Aant inii". and the external ones are divided into an anterior 

 with ei^ht and a posterior one with four tentacula. I'pon the 

 left >ide. moreover, the four posterior t cut acles .-ire modified into 



iiliar hectocotyle termed a */nli.i\ benrin^ a di>i-oidal fol- 

 licnl.-ir o-l; m ,l upon its outer surface. 



The organs of manducation are composed in the cephalopoda 



"f a l>eak in the form of two corneon- o|- c;dcaivoiis m:indibles. 



