MAGILUS.—rLATE I. 



wliicli maintained the spiral form tor several wide 

 •whorls, probably in consequence of inhabiting a cavity 

 in a coral that had ceased to grow. i\ a very thin 

 young shell in sihi ; <l, a more advanced specimen, 



showing the commencement of the thickened and entire 

 peritreme, which would probably have resulted in a 

 tube, e, a second full-grown specimen, showing the 

 aperture in front. 



