Coat of arms of Southland

The blazon

or, a dragon, segreant, vert, on a chief gu. three spears heads ar. — Crest, a lion s gamb, erect, or, grasping a spear-head ar. [ Granted, to Sir William Southland, of Rumney, by Camden, Clarencieux, in June, 1604.]

A blazon is the description of a coat of arms in the technical language of heraldry. The drawing comes from that text, and from nothing else.