We have measured the resistance R, magnetoresistance, and magnetization of sintered samples of the compounds SnxEu~.2-xMo68s, where x = O, O. 12, 0.24, and 0.48. A large resistance anomaly beginning at T--100 K and extending to low temperatures is found in all of the alloys except x = 0.48, which had a high superconducting transition temperature Tc--11.3 K. The resistance anomaly, which appears to be correlated with the depression of Tc, is also correlated with a large negative magnetoresistance at temperatures T <--12 K. For all samples except x = 0.48, that part of the magnetoresistance attributed to spin-flip scattering is proportional to the square of the magnetization M 2 and is 30-40% of R (O) for some samples. Magnetization measurements are consistent with a spin-7/2 paramagnetic behavior of Eu 2+ ions when allowance is made for a concentration of 20-30% nonmagnetic (J = O) Eu 3+ ions as determined from Miissbauer measurements. The experimental results are inconsistent with predictions of dilute magnetic alloy Kondo models. We speculate that the resistance anomaly and suppression of Tc for x <-0.24 are associated with a semiconductor-like behavior.