Note 2 — Chapter V · RESPIRATION IN LAND CRABS.
W. S. (William Sweetland) Dallas translation
This smaller Gelasimus is also remarkable because the chameleon-like change of colour exhibited by many Crabs occurs very strikingly in it. The carapace of a male which I have now before me shone with a dazzling white in its hinder parts five minutes since when I captured it, at present it shows a dull gray tint at the same place.