Mine

Actually one of the coolest teeth I have seen! Great find. 

Hole doesn't seem man-made to me...

OR Sylvestrilamia teretidens based on crown extending out to cusplets

OR Sylvestrilamia teretidens based on crown extending out to cusplets? 

@Fin Lover, this ID is based on input that @siteseer provided here: 
 

Based on the enamel "shelf" on the labial side, I would have IDed this as a retroflexus.  May I ask what features indicate desori?  

Oh! I am so sorry for the late reply as I never got the notification. Sadly I have not, besides a familial (mostly superficial) resemblence to the modern ratfish (probably from the same diet) I have not gotten any clear answers. 

 
 
Jokes aside, a true Id may never come unless far into the future. I still have hope one day someone can help with this ID. 

Nice Point! I really like the color of the chert!

Such a pretty tooth! I love the colors and the cusplets

Bucket list… only half of one so far. That’s just lovely. It’s absolutely still, “delicate”. I don’t know if that makes sense. Of course it’s delicate, but I just mean its vibe is still contained. The broken pieces, even if large and visibly pretty, are missing the delicacy of a sand dollar. So they feel like a piece of fossil instead of what they are. 
 
Sorry for rambling. Currently looking through your awesome pictures to try and find a new tooth I found. 
 
Jp