I found this in a field hunting fossil wood. Back in 2006. : Field of view about 10mm. The pinched end of what I had assumed to be some sort of coral. Helena, Texas. The end view is ground smooth & shows 2mm circular whirls. With spiraling partitions. Almost impossible to photograph. I can only see one clearly with 10X. This fossil may be a negative cast? As the crust of the stone spalled. Anyhow- with nothing to compare. I have decided to put money on Receptaculites.......-=James