Axial Lead Capacitors - BC 050 - What Are These Markings?
Those look like monolithic resin dipped ceramic capacitors. From your description of where they are they appear to be being used to stiffen the analog inputs against the S&amp;H of the internal ADC. Given the adc is pretty slow (40-120ms a conversion), I'd guess they were 50nF. 

With ceramics the first letter is usually the voltage rating, and the second letter is the temperature coefficient, then the value in PF. 050 would normally be 5pF but that seems very unlikely given their location. (also given a lowish voltage rating of B, you'd expect the capacitance to much larger given the package size). 

Monores ceramics usually have terrible tolerances so tend to be used for decoupling, so are usually in the nF-uF range, so I suspect the 050 refers to a value in nF.