Per pale;  Azure, a dolphin uriant entwined around an anchor Argent.
 Gules, on a
fess Argent [tilted bendwise] between two mullets of six points Or, a Wolfsangel contourny Sable.
The above is a copyrighted picture reproduced here by permission. © 2009 by Jochen Wilke.
Motto : Festina Lente (hasten slowly).
[ That maxim is traditionally symbolized by a dolphin coiled around an anchor.
The dolphin stands for swiftness, the anchor is for caution and safety.]
Festina Lente (hasten slowly) was the official motto (or "Royal Proverb") of Emperor Augustus (who reigned alone over the Roman Empire from 27 BC to AD 14). He adopted the corresponding dolphin coiled around an anchor as his personal symbol. That well-known icon was used as an explicit reference to Augustus himself on the reverse of some silver denarii minted during the reigns of the three emperors of the Flavian dynasty: Vespasian (AD 69-79) Titus (AD 79-81) and Domitian (AD 81-96). The Flavians may have done that for political reasons: Advertising the personal symbol of Augustus helped compensate for their lack of actual family ties with the first five emperors of Rome (i.e., the Julio-Claudian dynasty).The abbreviated markings on the coin shown above read: TRPOT = tribunica potestas (Tribune of the People), COS VIII = Eight times a consul, PP = Pater Patriae (Father of the Country). There are other examples of silver denarii bearing a dolphin entwined around an anchor that were struck at different dates:
The Wolfsangel at left, shown contourny in the Gmelin arms, is a masonic symbol of ancient Nordic origin ( unrelated to the Eihwaz rune). In an horizontal position it's also called a werewolf. The upright version (looking like a backward Z with a central stroke) can be called a thunderbolt. Without a central stroke, that heraldic charge would be blasoned Doppelhaken in German or crampon in French (e.g., Biedenfeld: In Schwarz ein liegender silberner Doppelhaken ). It is a more recent (medieval) symbol for the double hooks used by soldiers to climb the wall of fortified castles. Arguably, the legendary danger of such climbs makes this a symbol for military bravery...
In modern times, the Wolfsangel has become a tainted nazi symbol whose "use" is strictly forbidden by German Criminal Law Para 86(1).4. Like the Swastika (gammadion, or fylfot) pictured at left, the Wolfsangel can no longer be used as a benign ancient mystic symbol by masons or anybody else ... Other runic symbols used by the Nazis are often not as tainted as the Wolfsangel, which was used as the divisional marking for Hitler's infamous 2.SS-Panzerdivison Das Reich. The inverted version of the Wolfsangel symbol was used as the graphical basis for the logo of Aryan Nations (AN) the neo-nazi American organization founded in 1970 by Richard Girnt Butler (1918-2004).
blog (2007) | The Dolphin of Legend and of Heraldry | Titus and the Dolphin
Leopold Gmelin (1788-1853) son of the naturalist Johann Friedrich Gmelin (1748-1804) was a grandson of Philipp Friedrich Gmelin (1721-1768; FRS 1758), the younger son of the first bearer of the coat-of-arm (see below). This younger branch of the family may or may not have borne the coat-of-arms described here.Leopold Gmelin introduced Gmelin's test and invented red prussiate (1822). He was a collaborator/mentor of Friedrich Wöhler (1800-1882) founder of organic chemistry.
Christian Gottlog Gmelin (1792-1860), professor of chemistry and pharmacy at the University of Tübingen was a grandson of Johann Konrad Gmelin and a great-grandson of the traveler Johann Georg Gmelin, Jr. (1709-1855) himself the eldest son of Johann Georg Gmelin, Sr. (1674-1728) who was the first bearer of the above coat-of-arms.
Several alumni of the University of Tübingen were awarded the Nobel Prize in Chemistry :
Gmelin Family + Wikipedia (in German) | Leopold Gmelin | Christian Gottlog Gmelin (1792-1860)