80 TURRITELLA. 



*^ Turrltella dupUcata is a heavy shell, often 

 more than four inches long. It is sulcated and 

 carinated; the colour is yellow-white. T. hi- 

 cingulata is white, marbled with yellow ; the 

 whorls are girded with two ridges. There are se- 

 veral fossil species of this genus in London clay." 



'^ I think," said Lucy, "that three or four 

 genera have been taken out of Turbo — Scalaria, 

 Delphimila, LitoraUa^ and TurriteUa, 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 1 cannot 

 enter into all the niceties of modern conchologists. 

 However, the generic name of a shell, according 

 to Linnffius or Lamarck, is usually given, there- 

 fore I hope you will not be greatly at a loss upon 

 meeting with some apparently unknown genus." 



