Proraster
Proraster is a genus of echinoderms belonging to the family Hemiasteridae. The species of this genus are found in Europe, Northern America and Australia. Species:

Proraster atavus 
Proraster geayi 
Proraster granti 
Proraster jukesii 
Proraster magnus 
Proraster oedumi

References

Spatangoida
Echinoidea genera