Port Jackson's Shark is actually the largest species of Heterodontus (Genus of Horn/Bullhead Sharks) - they average about 4-4.5ft as mature adults, while the largest females have been recorded to be nearly 5.5 ft long.
As for Cali Horn Sharks - males tend to average about 32-36" in length.
As for Cali Horn Sharks - males tend to average about 32-36" in length.