This tube worm has calcareous tubes cemented together. Small blackish-brown tentacles protrude from a raised rim of the tube,
See Ryan’s underwater set on Flickr with a range of invertebrates:

Serpula columbiana from the photo above along with at least two other species of Polychaete. Dodecaceria concharum Dodecaceria fewkesi and a lined chiton,a nudibranch and Balanophyllia elegans the orange cup coral along with an unknown species of crab.
Domain Eukarya
Kingdom Animalia
Phylum Annelida
Class Polychaeta
Subclass Canalipalpata
Order Terebellida
Sub Order Cirrabuliformia
Family Cirrabulidae
Genus Dodecaceria
Species fewkesi
Common Name: Fringed filament worm
Other Annelids at Race Rocks
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&nbs