IV. On the anatomy and physiology of Protopterus annectens

The work which has resulted in the present paper was begun in Freiburg in the summer of 1888, when the author was fortunate enough, owing to the generosity of Professor Wiedersheim, to obtain a number of fresh specimens for examination. As so many interesting points presented themselves at an early stage in the research, a short preliminary notice, without illustrations, was published in the following autumn (‘Berichte d. Naturforsch. Gesellschaft zu Freiburg i. Br.,’ vol. 4, 1888).