CEPHALOPODA. 



India, and China Ink Fossil ink-hag's Octopus vul- 

 garis ^he colour " Sepia" Sepia qfficinalis > or 

 " Cuttlefish" Guttle-bone Loligo vulgaris Edible 

 Cuttlefish Chemical nature of their Colour 'Nau- 

 tilus -Jlrgonauta Garinaria. 



GASTEROPODA. 



^he Syrian purple Curious properties of the colouring 

 matter of Sea-snails -JVLurex brandaris (Purpura 

 lapillus Helix fragilis Tcundincu fragilis (Pur- 

 pura patella -JVLurex truncatus Experiments with 

 American Sea-snails Colour furnished by Whelks 

 Ijuccinum -Influence of light upon the production of 

 their colour Process used by the ancients to dye pur- 

 ple Uric acid in Grasteropoda -JVLurexide Snails 

 that are reared for food, etc. Helix pomatia Snail 

 gardens H. aspersa H. horticola jlrion rufus 

 Chemical Jlnaly sis of Snails Limacine Helicine 

 Uric acid in H. pomatia (-Turbo littoreus, or (Peri- 

 winkle Haliotis Snails used as money Gyprcea 

 moneta Other species of Gyproea " Love- shells" 



