Sabellidæ
Small sabellids are common in holdfasts and seaweed masses.
Serpulidæ
The calcareous tubes of these animals are seen everywhere below half tide, on rocks, in holdfasts and on kelp (spirobis). I have six different serpulids.
Hermellidæ
There are probably two species of this family common at Laguna.
Sabellaria californica Fewkes.
This form was found in large colonies in the protected crevasses of cliffs west of the laboratory. The colonies are some twenty feet long, two feet wide and ten inches thick. The tubes are of loosely agglutinated sand and are crowded very closely together with their mouths evenly disposed over the surface of the colony.
Another species lives singly in very hard, thick sand tubes. Some specimens have algæ growing on their opercula.
Turbellaria