The Sponges of the Leyden Museum. I. The family of the Desmacidinae

The Leyden Museum of Natural History possesses a collection of Sponges, which have never as yet been thoroughly examined nor classified in accordance with the progress, which has lately been made in this branch, of science. And so it was with much pleasure that I accepted the honourable task of determining and arranging this collection, being at the same time convinced of the necessity of treating the different groups separately.