However , a few brightly coloured species are also known .
Typically , calcareous sponges are small , measuring less than 10 cm ( 3.9 in ) in height , and drab in colour .
A few brightly coloured species are also known .
Typically , calcareous sponges are small , measuring less than 10 cm ( 3.9 in ) in height , and drab in colour .