Ecdysis (moulting/molting) of crab <i>Callinectes sapidus</i>.
W. P. Hay
1904
Rearranged by  <a href="//commons.wikimedia.org/wiki/User:Luis_Fern%C3%A1ndez_Garc%C3%ADa" title="User:Luis Fernández García">LP</a>  from “<i>Life History of the Blue Crab (Callinectes Sapidus</i> by W. P. Hay. Report of the Bureau of Fisheries 1904. Plate III and IV (p. 413) .” Source: NOAA Photo Library (<a rel="nofollow" class="external text" href="http://www.photolib.noaa.gov/fish/fish3185.htm">fish3185</a> and <a rel="nofollow" class="external text" href="http://www.photolib.noaa.gov/fish/fish3186.htm">fish3186</a>).