CONTENTS.
At the outset of this memoir it must be said, that it is in fact a joint work by the first discoverer of the remarkable hypostomic structure to be described, Herr G.Liljevall, and by myself. A considerable portion of this work belongs to him as he with great discernment searched for a large amount of the material, prepared it as to be fit for the many microscopic sections which he executed, and at last with his well known artistic skill drew the figures. My share, again, in the common work consists in the supervision of the figures, in the arrangement of the observations and details in a coherent form, in which suggestions and remarks of HerrLiljevallhave been of great use, further to write the descriptions and to make all the necessary researches in literature, so whatever may be faulty in these respects must be laid to my charge.
September 12th 1900.
G. LINDSTRÖM.