These photos were taken on February 21, along with the Botrylloides and other sea squirts. I’ve put the images on iNaturalist but haven’t tried to identify them. This is because I’m overwhelmed by the sheer amount of marine life. There are so many different taxonomic groups.
The above is likely to be a calcareous sponge Possibly belonging to the genus Sycon.
According to Wikipedia,
These sponges are small, growing up to 7.5 cm with a length from 2.5 to 7.5 cm, and are tube-shaped and often white to cream in colour. They are known to aquarium hobbyists as “Pineapple” or “Q-Tip” sponges, and are frequent “hitchhikers” accidentally brought in.
This website has more information about Sycon sponges.
The below has a slight resemblance to a species that was identified as Polyclinum constellatum, but I don’t think it is. Then again, it could be the same specimen!