ClipArt ETC
"Their shells are usually of a leathery texture, nearly transparent, and usually spring from a root-stalk of similar consistence, which creeps along upon the surface of stones or aquatic plants, in which situations these animals are not uncommon." — Goodrich, 1859

Plumatella

"Their shells are usually of a leathery texture, nearly transparent, and usually spring from a root-stalk…

"Diagram of an Ectoproctous Polyzoon (Plumatella). L., Lophophore; PH., pharynx; A., anus; S., stomach; M., retractor muscle; F., funiculus, a cord of mesodermic tissue; O., cells that form "statoblast" buds; B., an ordinary bud; E., epistome over the mouth; T., tentacles; Sh., outer wall of zooecium." -Thomson, 1916

Plumatella

"Diagram of an Ectoproctous Polyzoon (Plumatella). L., Lophophore; PH., pharynx; A., anus; S., stomach;…