NOMENCLATURE. 
22 ' 
fusiformis. Fusiform ; intermediate between co^ 
nical and ovate, or tapering and a little 
ventricose. 
imhricata. 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. 
lineis crispata. Wrinkled ; rendered rough by 
flexuous lines. 
marginata. 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 ; divided internally by 
various partitions. 
radicata. Radicate ; affixed by the base to some 
foreign substance. 
rostrata. Rostrated ; beaked. 
