from The Century Dictionary.
- noun A genus of fossil ganoid fishes of the Old Red Sandstone, having a cartilaginous endoskeleton, an enameled and sculptured bony exoskeleton, two anal and two dorsal fins alternating in position with one another, and an extremely heterocercal tail.
Sorry, no etymologies found.
Though it required skill to determine the place of the pterichthys and coccosteus there could be no mistaking the osteolepis -- it must have been a fish, and a handsome one, too.
The one-sided form of the tail in the osteolepis &c. finds a similar analogy in the form of the tail in the embryo of the salmon.