The Seven Signs of Tarnis were:
Long ears, with tips
Smooth and hairless bodies
Jerrod Northi - rogue, pirate and a citizen of Pemath - was desperate enough to want to go through the transformation. It cost 100,000 units for the Craftsmen to endow him with the Seven Signs - a rather steep price even for him. But he would pay it somehow, for since the attack of the deadly leeris, he feared that the cost of missing this opportunity to find a refuge in the land of Tarnis would be even higher.
Avram Davidson (1923 - 1993)
Avram Davidson was born in New York in 1923 and was active in SF fandom from his teens. He is remembered as a writer of fantasy fiction, science fiction and crime fiction, as well as many stories that defy easy categorisation. Among his SF and Fantasy awards are two Hugos, two World Fantasy Awards and a World Fantasy Life Achievement award; he also won a Queen's Award and an Edgar Award in the mystery genre. Although best known for his writing, Davidson also edited The Magazine of Fantasy and Science Fiction from 1962 to 1964. He died in 1993.
For more information see www.sf-encyclopedia.com/entry/davidson_avram