The individuals of the colony are called zooids and many zooids with individual siphonal openings cover the surface of the colony. |
|
Its anterior siphonal notch is shallow and not adjacent to the columella, and its two nearly parallel folds strengthen within the aperture and are less visible exteriorly. |
|
Below it is the more fleshy languette or curtain valve which closes the incurrent siphonal opening when required. |
|
The proboscis slips out the siphonal canal, unrolling, the barbed teeth spring forward. |
|