What does "shovelnose" mean?

Shovelnose: (a) The common sand shark. See under Snad. (b) A small California shark (Heptranchias maculatus), which is taken for its oil. (c) A Pacific Ocean shark (Hexanchus corinus). (d) A ganoid fish of the Sturgeon family (Scaphirhynchus platyrhynchus) of the Mississippi and Ohio rivers; -- called also white sturgeon.