Text Figure: Representative Tunicata
A. Solitary, sedentary ascidian or ‘sea-squirt’. B. Colony of Boltenia sp., a compound sedentary ascidian with zooids on the ends of long stalks which bud off from a common stolon. C. Lateral view of Salpa sp., a pelagic tunicate in which the pharynx is perforated by only one gill-slit on each side. D. Dorsal view of Salpa sp. E. Colony of Pyrosoma sp., a pelagic tunicate noted for its phosphorescence. F. Longitudinal section of colony of Pyrosoma sp. showing zooids imbedded in the gelatinous wall. G. Single zooid of Pyrosoma sp. ex.a, exhalent aperture; in.a, inhalent aperture; ph, pharynx perforated by numerous gill-slits; st, stomach; t, tentacle; z, zooid.