Hi again, I think that when it shows two cross sections is simply an error (which may have been made in the original publication?), as in all cases the cross-sections shown are exactly similar to one another. It is in the listing for Trochulus hispidus, Trochulus striolatus and Humboldtiana nuevoleonis and just now I noticed that the first one with two is Helicella itala. Thanks! Good wishes,