phocal vs phocine

phocal

adj
  • Pertaining to seals 

phocine

adj
  • Pertaining to a seal (or similar pinnipeds); seallike. 

noun
  • A member of the subfamily Phocinae, comprising the "true" or "earless" seals. 

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