Dr. med. Hans–Jürgen Fischer

Specialist FMH for Radiology and X-Ray Diagnostics,

Regional Hospital, CH-2900 Porrentruy, Switzerland

E-mail: hans-jurgen.fischer@jura.ch

for providing me with this spectacular radiograph of a large barrel sea snail (tonna galea L.)!

Fischer, H.-J. (1999). Chaos und Symmetrie. Schweizerische Aerztezeitung, 80(22), 1385-1389 (Figure 3, p. 1386).