The original spelling is Cistena pallassii with a double s. This is the spelling used in the ICZN Opinion. However, most frequently the spelling used has been the expected 'pallasii'. This single s is for example the spelling used in McIntosh (1922) monograph under Lagis koreni, and in the Hartman catalogue.
Leach, W.E. (1816). Annulosa. In: Encyclopedia Britannica, supplement to the fourth, fifth and sixth editions 1:401-453, pls. 20-26. (vi-1816)