Dogfish (scyllum) vertebral column t.s. -Fresh water fish, region of gills t.s. – Fresh water fish, region of tails t.s. – Fish scales, various types w.m. – Tadpole frog, larva t.s. through body – Frog (Rana) blood smear – Frog (Rana) tongue t.s. – Frog (Rana) intestine t.s. – Frog (Rana) lung t.s. – Salamander skin, t.s. with poison glands.