"I think," said Lucy, "that three or four genera have been taken out of _Turbo_--_Scalaria_, _Delphinula_, _Litoralia_, and _Turritella_, and that _Litoralia_ is not Lamarck's genus." "You are correct," replied her father, "and indeed so many alterations are continually taking place in the generic names of shells, that I cannot enter into all the niceties of modern conchologists. However, the generic name of a shell, according to Linnæus or Lamarck, is usually given, therefore I hope you will not be greatly at a loss upon meeting with some apparently unknown genus." CHAPTER XI. [Sidenote: RANELLA. VOLUTA. OVULA.] "What is Charles drawing from his pocket with a look of so much importance," said Mr. Elliot, the next time they met. "There is _Ranella crumena_, thorny-frog; _Ovula gibbosa_, the shuttle; and _Voluta musica_, the music-shell," said Charles. "Oh, who gave you those nice shells?" asked Lucy, "and how do you know the names?" "Let my father say if I am correct, first," replied Charles. "Perfectly," answered his father; "but I fancy that I can guess how you obtained your information. You have been buying these specimens, and had the names from the shell-vender. I hope your purchase did not cost much, for they are not rare shells?" "No; I should not choose to spend a large sum, even from my purse, until I am a better judge of the value of shells. But as our collection is but small, I thought that Lucy would be glad to see an addition to the stock." [Sidenote: CANALIFERA, CERITHIUM.] "Thank you, brother," said Lucy, "you never forget me in your purchases or your pleasures." "Let us return to our subject," said Mr. Elliot, "and notice the families of the next section, which are all carnivorous, living on animal substances. They have a projecting syphon, which conveys the water to them: they are all marine. The syphon passes through the base of the aperture, either into a canal, or channel, or a narrow, recurved margin. The mouth is furnished with a trunk. * * * * * "_Canalifera_ contains in the first section, _Cerithium_ Chiefly _Murex_. _Pleurotoma_ _Murex_. _Turbinella_ _Voluta_ and _Murex_. _Cancellaria_ _Voluta_. _Fasciolaria_ _Murex_. _Fusus_ _Murex_. _Pyrula_ _Murex_ and _Bulla_. [Sidenote: FOSSIL CERITHIUM. TURBINELLA.]