These burrows belong to the California Turret Spider (Antrodiaetus riversi, family Antrodiaetidae). This is part of an ancient group of spiders in the same suborder as the tarantulas and trapdoor spiders (Mygalomorphae). Based on research by Starrett and Hedin (2007) these individuals are part of the Monterey clade, a geographically and genetically isolated population of these fascinating spiders.
They are nocturnal hunters, waiting at night at the entrance of their turrets. When an insect walks across one of pine needles or other debris woven into their turret, it acts as a trigger, signaling to the spider the prey's location and size.
Red bill pretty distinctive.
"Stem" part was about 5 feet long. The round part shown here was about 6" in diameter.
Female - nose injury probably from mating.
Adult female perhaps?
Vetch, Point Lobos State Reserve, California
Not much to show for the effort; but fun trying to photograph these at the top of the Garapata loop...