Holaster simplex echinoid from Texas

Another interesting echinoid from Texas is this Holaster simplex from the Duck Creek Formation (Cretaceous, Albian stage). It was found near Lake Texoma in Grayson County, Texas.

Adapical surface (top) 

Posterior

Anterior

Adoral surface (underside or bottom)

Left profile

Right profile

I received this fossil from an auction on the Fossil Forum site. Thank you Travis for this nice Echinoid!