CLASS gasteropoda: oedeb peosobeawchiata. 245 



Fig. his. 



Sbxixs op GASTER0P0D8 USED FOR ORNAMENTS. — 1. Oymtmt/m brocteHjni ,' 



rithium; 3. VdiUa imperiSlis ; 4. CarHavm eldtum; 6. Phorus agglu&natis ; 

 6. Murex tenuisjUnus ; 7. VemiStue eburnSus ; 8. Trochm nilo&em ; 9. IMwiClmmi 

 ■ 10. Tuniteaa. 



ORDER PROSOBRANCHIATA. 



G-eneral Characteristics. — The Prosobranchs (gills 

 forward) have the gills placed in front of the heart. 



Muricidss (rock-shells). — The Murex has the aperture of 

 its shell prolonged into a canal. * It is carnivorous, destroy- 



* The Shetlanders use this shell for a lamp, inserting the wick in the canal and 

 filling the hody of the shell with oil.— From these MoUusks the ancients ohtained the 

 costly Syrian dye, the "purple" of Scripture. 



