1. 1901 Lankester's A treatise on zoölogy, part IV, Platyhelmia, Mesozoa, and Nemertini. A. & C. Black, London.
2. 1904 Helminthologische Mitteilungen. II. Arch. f. Naturg., H. 1, 70, S. 229-251.
3. and 1908 A text-book of the principles of animal histology. Macmillan, New York.