38 NOMENCLATURE. 



Jiisiformis. Fusiform ; intermediate between co- 

 nical and ovate^ or tapering and a little 

 ventricose. 



imlricata. Imbricate ', with plaits parallel to the 

 margin. 



interrupta. Interrupted ; continued by new ac- 

 cretions^ or additions of the shell. 



involuta. Involute ; having the margin of the 

 exterior lip turned inward. 



linels crispata. Wrinkled ', rendered rough by 

 flexuous lines, 



marginaia. Marginate; the sides of the shell 

 being thickened. 



ohovata, Obovate ; nearly oval, but narrower and 

 produced at the base instead of the apex. 



perfoUata. Perfoliate; having a horizontal suture 

 girt with a deflex or overhanging margin, 

 as if one shell were placed upon another. 



polythalamia. Chambered 3 divided internally by 

 various partitions. 



radicata. Radicate ; affixed by the base to some 

 foreign substance. 



fostrata. Rostrated 5 beaked. 



