DIQE8T1 \ I. DBG :;l 



-eparaled in I lie ( 'a l:i 111:1 ries, in Sepia ;nnl Sepiola; le>s NUILI hut 

 \\ellseparated in ( hnmast replies ; luit lit t le ->ep:i rated iiiOn\cln> 

 ten! hi--, in Loli-np-i- and in 1 1 i>t ioletit hi>. which ;it the same 

 time h:i\ c :i much longer, more curved and ->h:i rper rost nun. 'I' he 

 po-terior expansion is short, composed of three npi.-il lobe- in 

 the Argonauts .-ind TreiiK >ct < >pus. very loii.n' :tli<l with onl\ :in 

 indication of :i lobe in Octopus. and without lobe* in Sepia, the 

 < 'alamarie-. Ko ia and :ill other cephalopods. 



Tin- rostr;il ji.-irl of the inferior niMiidible is ronnde<l liehind in 

 all the octopods. shuitiiiL: in the d ecu pods. The win us :ire short, 

 wide in Arir>n:iiit:i :in<l Trcinoctopus ; very Ion-'. 11:1 rrow and 

 Mi'ciuitt'd in Octopus; IMO, >t i-ni^ht^ and wide in Sepia, etc.; 

 short in Onychotciithis and Ommastrephes. r l'he po^terioi 

 pansiun is wide, not c-ai'inated above in ArgODauta and Tivm- 

 octopus; very 1 01 in', narrow, ca rinateil in Octopus; moderately 

 loiiLi. wide, carinated ahove, more sloped in Sepia. Sepiola and 

 the ( 'alamaries ; very short much carinated. strongly sloped be- 

 hind in OnychoU'iithis. Ommast replies, etc. 



Tuder the tongue is found a Ik-shy mass covered with papilln'. 

 which is supposed to be the or^an of taste; and in Nautilus we 

 tind similar papilla- on the tongue (behind the teeth), to its 

 enirance into the gullet. 



The lleshy tonu'iie is armed above with rows of recurved, 

 spimuis teeth, the a rra n^eini-nt of wiiich dill'ers in t he va riou> 

 r:i. Ordinarily, as in the dibranchiates. we find the series 

 of teeth to consist each of a central one with three side-teeth on 

 either side of it, and some! inu s. as in Kledone and Lolii^o. an 

 addition.-il plate on either side; but in Nautilus we find a modi- 

 fication in five somewhat quadrangular central teeth of which the 

 middle one has the most pointed end, and on either side t wo 

 Inutr |';IIIM- S with a much smaller plate at the base of each in all 

 thirteen teeth in a s t -ries. The cent nil teeth, which are simple in 

 Sepia and Sepiola. a re I ricii>pid in Loli^o and denticulated in 

 Kledoiie; whilst the lateral H/K-//I/ 'are usually cla w-like. l-'iftv 

 tow- of teeth may be found on the tongue of the Sepia: their 

 continuous growth compensates the lo>- by abrasion. 



< Plate- ."> and (\ exhibit the teeth of \arioii- ce|.halo|)0( Is.) 



The rounde<l. -ack-like ^tninarh which i> -ituated towards t he 



middle or end of the body ia counectfd with the mont h i>\ a 



