Specific heat measurements between 50 and 800 mK of the three magnetic superconductors ErxY1-xRh1.1Sn3.6 With x = 0.4, 0.8 and 1, respectively, are presented. For these compounds broad anomalies with maxima at 245, 360 and 435 mK, respectively, were observed. No sharp peaks were detected. This means that magnetic short-range order gives the main if not the full contribution to the specific heat. A low-lying doublet is responsible for the magnetic behaviour below 1 K. The results are compared with some theories.