Bill Heim

Any kind of marked ruler will work, it doesn’t have to be “official”.

Appears to be a sand tiger tooth possibly from Morocco from the coloration.

Lower Carcharhinus species indeterminate

Lower anterior Hemipristis serra

Would like to see the other side. From what I see so far, it looks like turtle shell, could be alligator but from the side I see there is no indication of that. Alligator (and crocodile) scutes have large pits on the dorsal side which is distinctive. See: Specimen 60952 The difference with a crocodile scute is that a crocodile scute doesn’t have the large dorsal ridge.

Turtle

I believe it to be an ammonite

Great White, Carcharodon carcharias

Would need to see the other side

Probably Carcharhinus limbatus blacktip shark

A dark tooth against a black background would not show up well. Probably Carcharhinus limbatus blacktip shark

C. hopei is now called Hypotodus verticalis (Agassiz)

Crocodilia and Crocodylia are interchangeable depending on the author

species is mississippiensis, author is Cuvier. You can use picture processing software (probably some came free with your computer, tablet or phone) to correct the brightness and contrast which would bring out more detail in the images.

Small image but appears to be an eagle ray Aetobatis

Unfortunately most lower teeth of various Carcharhinus are indeterminate as to species

Probably a shark vert but would need to see the side to confirm whether shark or fish

See also specimen 60619