What is "organ of bojanus"

The organs of Bojanus or Bojanus organs are excretory glands that serve the function of kidneys in some of the Mollusca. In other words, these are metanephridia that are found in some mollusks, for example in the bivalves. Some other molluscs have another type of organ for excretion called Keber's organ.

The Bojanus organ is named after Ludwig Heinrich Bojanus, who first described it.