126 CEPHALOPODA. 



Cuvier, and subsequently more fully investigated by De 

 la Fresnaye, tbe title of whose paper*, ^^ Sur la mobilite 

 des taches que Ton remarque sur la peau des Calmars 

 subule et sepiole (de Lamarck), et sur la coloration spon- 

 tanee dont les sepiaires paraissent susceptibles/^ will 

 speak for itself. He inferred that this characteristic 

 phenomenon was similar to that of the chameleon. All 

 Cuttlefishes are more or less phosphorescent. The 

 eyes have a microscopic property, and may almost serve 

 as magnifying-glasses. " China ink '' or " Indian ink '^ 

 was formerly supposed to be prepared from the fluid of 

 some kind of Cuttlefish ; but it has now been ascertained 

 that the base of this paint is soot from the smoke of 

 oil-lamps. " Sepia/^ however, has a more legitimate 

 origin. Cuvier used the colouring-matter of S. offici- 

 nalis to illustrate the plates in his famous ^ Memoires.' 

 The odontophore of the Cephalopods somewhat re- 

 sembles that of the Pteropods (Woodward) . 



The derivation of the word '^ cuttle " is given in the 

 ^ Imperial Dictionary ' as from the Saxon verb " cudele,^^ 

 in Welsh "cuziaw,^^ and in Armorican ^'^ cutafi"^^ or 

 ^^cuddyo,''^ all signifying the sense of withdrawing or 

 hiding ; hence our pet word " cuddle.^^ 



This class is the Cryptodibranchiata of De BlainviUe. 



Order DIBEANCHIATA, Owen. 



Body naked : gills 2. 



Mr. Hyatt (Mem. Bost. N. H. Soc. n. s. i. pt. 2. 

 p. 208) calls these the ^' polar '^ forms of the Pteropoda, 

 and observes that " the general aspect, the arrangement 



* Mem. Soc. Linn, du Calvados, 1824, pp. 73-84. 



