Conophytum ernstii ssp. cerebellum PVB 5154 (west of Gamkab River)
This subspecies has ridged bodies which in young and vigorous plants are much more prominent and contorted than in this photo. A more recent collection by Peter Bruyns (Bruyns is pronounced as "brains" - get the connection to the name?) under his number PVB 10043 has even more pronounced ribs on the body.