Shell thin walled, with spiny surface; in each corner of the hexagons is one bristle-like radial spine twice as long as one pore.
In the corners of the hexagons (between every three meshes) arise radial spines, about twice as long as the pores.
From every corner of the hexagons (between three pores) arises a very thin, hair-like, short radial spinule.
Then what does he mean by ...
