Clarence’s Dream of the Sea Bottom--Diving-bell--Lobster-horn--
_Campanularia_--Medusa-like Progeny--_Scalpellum_--Acorn
Barnacles--Necked Barnacle--_Pyrgoma_--Cirriped
Transformations--Tube-worms--_Serpula_--Its Shell--Hooks
and Bristles--Gills--Stopper--Its Homology and Use--
_Sabella_--Shell-tube--Gills--Soft-tube--Hook-plumed
Sabella--Process of Tube-building, 274-297