124 PHYLOGENY OF FUSUS AND ITS ALLIES, 



a sutural shelf. In one specimen (pi. XIV, fig. 6, M. C. Z. 1058) the 

 spirals continue after the wrinkles cease, the whorl apparently still re- 



FiG. 16. Clavilithes solanderi. A gerontic individual (after Sowerby). 



maining subglobular. In the succeeding whorls the depression seen 

 below the suture of C. conjimctiis is shown. 



The subconic whorls continue to the end of the adult or ephebic 



