Hello everyone,
I'm trying to get a better idea of the things I keep picking up(looking for?) at the river. I'm also trying to temper my own misguided enthusiasm, which has a tendency to steer me into false confidence. Judging from quantity alone my guess is that four of the objects in the photo are tilly bones of some sort, and two are worn cetacean bulla(I think). I have found many more of the suspected tilly bones, they have no symmetry, they all have a connection point from which bony fibers appear to radiate. At first I thought these to be bulla but my doubts have pressed me to seek a higher authority. The two on the left I believe are worn bulla, the four on the right are examples of the unknown bony beans, and the ruler is in mm.
thanks for your time.