Heraldic Puns abound in Cheshire - Leche of Carden

To this second group we can add the crests of Leche of Carden and Leche of Nantwich, who differenced, the one with a crescent on a crescent, the other with a ring, the old family crest of an arm coming out of a crown, the hand grasping the serpent of Aesculapius, patron of all leeches.

Leech of Cawarden, al's Carden
Arms: Ermine, on a chief indented Gules three ducal coronets Or, a crescent on a crescent for difference.
Crest: Out of a ducal coronet Or, a cubit arm erect proper, grasping a snake entwined of the first, a crescent on a crescent for difference. 

Leeche of Nantwich
Arms: Quarterly -
1 & 4 Ermine, on a chief indented Gules an annulet between two ducal coronets Or.
2 Azure, on a bend engrailed Argent three dawes (Jackdaw's)  Sable [Dawson]
3 Quarterly 1 & 4 [Vert] a cross engrailed Ermine a mullet for difference [Wettenhall]
                  2 & 3 [Vert] a bend Ermine, a mullet for difference [Wettenhall, Ancient]

Crest: Out of a ducal coronet Or, a cubit arm erect proper, grasping a snake entwined of the first, an annulet for difference