17.

D. plumosa* (Carter) (1849).

Genus 5. Trochospongilla, Vejdovsky (1883).

18.

T. latouchiana*, Annandale (1907).

19.

T. phillottiana*, Annandale (1907).

20.

T. pennsylvanica* (Potts) (1882).

Genus 6. Tubella, Carter (1881).