Stump pass beach fossils

[LiMaEvA]

Can anyone help us identify these? 

[Harry Pristis]

The 9 o'clock find is turtle.  The 6 o'clock find is a Holmesina sp. osteoderm.

 

 

[Danielb]

The one farthest to the right is bone.

[Plantguy]

The top/noon position item is a barnacle plate/fragment. Attached photo for comparison. 

and the other specimen to its right/below in the 3 o'clock position is likely a turtle/tortoise shell/carapace peripheral fragment due to that overall cross section shape and a possible sulcus line that I've highlighted in the attached photo for confirmation. Looks like a shallow/relatively straight groove on the surface, correct? If yes that would reflect the margin of the overlying scutes. 

Continued hunting success! 

Regards, Chris