Peronidella

Peronidella is an extinct genus of Calcareous sponges found in marine sedimentary rocks dated between the Devonian and the Cretaceous periods.
These sponges had cylindrically shaped walls, with a typical diameter of 2 cm, with a small platform at the top, showing the position of the Osculum.
Many species, such as "Peronidella furcata", were colonial; however, several solitary species are known.
These sponges are relatively abundant in European chalks