oyster drill vs periwinkle

oyster drill

noun
  • A type of sea snail, Urosalpinx cinerea (and others in subfamily Ocenebrinae, such as genera Urosalpinx, Eupleura, and Ocenebra), that uses an eversible gland to soften its prey's shell, and then drill a hole in the shell to consume the oyster or other shellfish. 

periwinkle

noun
  • A mollusk of family Littorinidae. 

  • A color with bluish and purplish hues, somewhat light. 

  • Any of several evergreen plants of the genus Vinca with blue or white flowers. 

  • Similar plants of genus Catharanthus. 

adj
  • Of pale bluish purple colour. 

How often have the words oyster drill and periwinkle occurred in a corpus of books? (source: Google Ngram Viewer )