razor clam

noun6

1. •
   A clam of several species in superfamily Solenoidea, with long curved shells resembling straight razors.
2. •
   Atlantic jackknife clam, Ensis directus.
3. •
   Razor shell, Ensis arcuatus, now Ensis magnus.
4. •
   Atlantic razor clam, Siliqua costata.
5. •
   Pacific razor clam, Siliqua patula.
6. •
   Gould's razor shell, Solen strictus